a speeding car is traveling at a constant speed of 39.5 m/s when it passes a stationary police car. if the police car delays for 7.79 seconds before starting off, what must be the magnitude of the (assumed constant) acceleration of the police car to catch the speeding car just at the border of the jurisdiction, a distance 715 away from the original position of the police car?

It will take the car 5.0 seconds to reach a speed of 30.0 m/s from its initial speed of 15.0 m/s with an acceleration of 3.0 m/s2.

Velocity is a physical quantity that represents the rate of change of an object's position in a particular direction. It is a vector quantity and is defined as the derivative of the object's displacement with respect to time.

The formula for final velocity (V) after accelerating for time (t) at acceleration (a) is given by:

V = V0 + a × t

Here, the initial velocity (V0) is 15.0 m/s and the acceleration (a) is 3.0 m/s2. To find the time it takes to reach the final velocity of 30.0 m/s, we can rearrange the formula as follows:

t = (V - V0) / a

Plugging in the values, we get:

t = (30.0 - 15.0) / 3.0 = 5.0 seconds

Therefore, it will take the car 5.0 seconds to reach a speed of 30.0 m/s from its initial speed of 15.0 m/s with an acceleration of 3.0 m/s2.

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So, the additional power required would be halved if the mass of the car was reduced to 700 kg.

To determine the additional power needed to achieve this acceleration, what is the equation used ?

P = m * a * v

Where P is power, m is mass, a is acceleration, and v is velocity.

First, we need to convert the speed from km/h to m/s:

110 km/h = 30.55 m/s

Next, we can find the acceleration by using the formula:

a = (vf - vi) / t

Where vf is the final velocity, vi is the initial velocity, and t is the time taken to achieve the acceleration.

a = (30.55 m/s - 70 km/h) / 5s = -13 m/s^2

For a 1400-kg car, the additional power required can be calculated as:

P = 1400 kg * -13 m/s^2 * 30.55 m/s = - 509,130 Watts

If the total mass of the car were 700 kg, the additional power required would be:

P = 700 kg * -13 m/s^2 * 30.55 m/s = - 254,565 Watts

So, the additional power required would be halved if the mass of the car was reduced to 700 kg.

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(a) Tension in the cable is 735 N. (b) Work done by the tension in cable is 9555 J (c) work done by the person weight is 8998 J (d) final speed of the person is 4.33 m/s.

a) The tension in the cable can be calculated using the equation of motion:

Tension = m x a + m x g

here m, mass of person (70 kg), a upside acceleration (0.70 m/s^2), and g, a due gravity (9.8 m/s^2).

= Tension

= 70 kg x 0.70 m/s^2 + 70 kg x 9.8 m/s^2

= 70 kg x (0.70 m/s^2 + 9.8 m/s^2)

= Tension

= 70 kg x 10.5 m/s^2

= 735 N

So, the tension in the cable is 735 N.

b) The work done by the tension in the cable can be calculated using the formula:

Work = Force x Distance

here Force is tension of cable (735 N) and Distance is vertical displacement of person is lifted (13 m).

Work = 735 N x 13 m = 9555 J

So, the work done by the tension in the cable is 9555 J.

c) The work done by the person's weight can be calculated using the formula:

Work = Force x Distance

here Force is weight of person climbed.

(70 kg x 9.8 m/s^2 = 686 N) and Distance is vertical displacement of person is lifted (13 m).

Work = 686 N x 13 m = 8998 J

So, the work done by the person's weight is 8998 J.

d) The final speed of the person can be found using the work-energy theorem:

Change in kinetic energy = Work done by net force

Initial kinetic energy = 0 (since the person is lifted from rest)

Final kinetic energy = (1/2) x m x v^2

Putting the values, we get:

= (1/2) x m x v^2

= Work done by net force

= Work done by tension - Work done by weight

= (1/2) x 70 kg x v^2 = 9555 J - 8998 J

= (1/2) x 70 kg x v^2 = 657 J

= v^2

= (2 x 657 J) / (70 kg)

= 18.8 m^2/s^2

= v

= sqrt(18.8 m^2/s^2)

= 4.33 m/s

So, the final speed of the person is 4.33 m/s.

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The formula for gravitational force between two celestial bodies is:

F = G * m1 * m2 / r^2

where F is the force, G is the gravitational constant (6.67 x 10^-11 N * (m/kg)^2), m1 and m2 are the masses of the two bodies, and r is the distance between their centers.

We can rearrange this formula to solve for r:

r = sqrt(G * m1 * m2 / F)

assigning in the given values:

r = sqrt((6.67 x 10^-11 N * (m/kg)^2) * (5 x 10^12 kg) * (4 x 10^20 kg) / (3 x 10^7 N))

= sqrt(6.67 x 10^-11 N * (m/kg)^2 * 5 x 10^12 kg * 4 x 10^20 kg / 3 x 10^7 N)

= sqrt((4 x 10^20 kg) / (3 x 10^7 N / (6.67 x 10^-11 N * (m/kg)^2 * 5 x 10^12 kg)))

= sqrt((4 x 10^20 kg) / (6.67 x 10^-11 N * (m/kg)^2 * 5 x 10^12 kg / 3 x 10^7 N))

= sqrt((4 x 10^20 kg) / (6.67 x 10^-11 N * 5 x 10^12 kg / 3 x 10^7 N))

= sqrt((4 x 10^20 kg) / (6.67 x 10^-11 N * 5 x 10^12 kg / 3 x 10^7 N))

= sqrt((4 x 10^20 kg * 3 x 10^7 N) / (6.67 x 10^-11 N * 5 x 10^12 kg))

= sqrt((4 x 10^20 kg * 3 x 10^7 N) / (6.67 x 10^-11 N * 5 x 10^12 kg))

= sqrt(4 x 10^20 kg * 3 x 10^7 N / (6.67 x 10^-11 N * 5 x 10^12 kg))

= sqrt(4 x 10^20 kg * 3 x 10^7 N / (6.67 x 10^-11 N * 5 x 10^12 kg))

= sqrt(4 x 10^20 kg * 3 x 10^7 N / (6.67 x 10^-11 N * 5 x 10^12 kg))

= sqrt(12 x 10^27 N * m / (6.67 x 10^-11 N * 5 x 10^12 kg))

= sqrt(12 x 10^27 N * m / (3.33 x 10^-11 N * kg))

= sqrt(12 x 10^27 N * m / (3.33 x 10^-11 N * kg))

= sqrt(12 x 10^27 N * m / (3.33 x 10^-11 N * kg))

= sqrt(12 x 10^27 N * m / (3.33 x 10^-11 N * kg))

= sqrt(12 x 10^27 N * m / (3.33 x 10^-11 N * kg))

= sqrt(12 x 10^27 N *

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A discount rate and the present value of an annuity formula can be used to determine the present value of cash flows from a pipeline that are projected to last indefinitely.

A series of cash flows' present value (PV) is the total of each cash flow's individual present values, discounted back to the present using a discount rate. The formula for calculating the present value of an annuity is the same as the formula for calculating the present value of a cash flow that never ends annuity.

The formula for the present value of an annuity can be used to determine the present value of these cash flows in this scenario if it is assumed that the cash flows from the pipeline would persist indefinitely. It goes like this:

PV = C / r

where C represents a steady cash flow and r represents a discount rate. The discount rate illustrates the temporal value of money by accounting.

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The net force that it would produce here is 20N

F(net)= F1 + F2

F1=15N

F2=5N

therefore

15+5 = 20N

The vector sum of the forces exerted on a particle or object is known as the net force.

The net force is a single force that cancels out the original forces' influence on the motion of the particle.

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Psychology is defined as the study of the brain in order to understand human behaviors.

The psychology science research field is a discipline aimed at understanding human behaviors and emotions by analyzing the functioning of the brain, which is the major organ in the nerve system responsible for modulating these types of functions.

Therefore, with this data, we can see that Psychology is a specific science research field related to understanding human behaviors and feelings by analyzing how the different parts of the brain are associated with this process.

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Answer: Psychology is the organized study of behavior and the mental processes that occur with it

Explanation:

Took the K12 test

Bolide NEO explodes in the atmosphere before reaching Earth's surface.

Small Near-Earth Objects (NEOs) can burn up in the Earth's atmosphere before reaching the surface. This phenomenon is referred to as an atmospheric explosion or a "fireball". When a small NEO enters the Earth's atmosphere, it encounters friction and heat generated by the rapid movement through the air. This heat can cause the object to vaporize, releasing energy in the form of light and heat that can be seen as a bright meteor.

In general, the smaller the NEO, the more likely it is to burn up in the atmosphere. The size and composition of the object, as well as its angle of entry and velocity, can affect the likelihood of it exploding in the atmosphere. The energy released from an atmospheric explosion of a small NEO is typically not enough to cause significant damage on the ground, but larger NEOs can pose a more significant threat.

To help prevent collisions with larger NEOs, scientists and organizations around the world are working to identify and track these objects, and to develop plans for mitigating potential impact risks. By understanding more about these objects and the potential dangers they pose, we can better prepare for and protect against the impact of NEOs in the future.

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If the centroid is at  I = 33.5 IN 4, then its centroidal x'-axis will be.

Simply put, the centroidal axis is a hypothetical line that passes through the centroid of an entity. Any axis that traverses the centroid of the cross section is said to be a centroidal axis. There is no limit to how many centroidal axes there can be. The main axes are two of these. The place inside an item where the force of gravity appears to be acting is called the centroid, or center of gravity. Any axis that traverses the centroid of the cross section is said to be a centroidal axis. There is no limit to how many centroidal axes there can be. The main axes are two of these.Out of all potential centroidal axes, the major principle axis is the one that has the biggest second moment of area, and the minor principal axis has the smallest second moment of area. The area's CG is the centroidal axis.

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A curve's unit tangent vector is a vector that points in the direction of the curve at a given point and has length 1. The length of the indicated portion of the curve is sqrt(33) units.

To find the unit tangent vector of the curve R(t) = 6t^3 I + 2t^3 j + 3t^3 k for 1 ≤ t ≤ 2, we need to find the derivative of R(t), which represents the rate of change of the position vector at a given time.

dR/dt = 18t^2 I + 6t^2 j + 9t^2 k.

To get the unit tangent vector, we normalize the derivative by dividing it by its magnitude:

|dR/dt| = sqrt(18t^2 + 6t^2 + 9t^2) = sqrt(33t^2)

T(t) = (18t^2 I + 6t^2 j + 9t^2 k) / |dR/dt| = (18t^2 / sqrt(33t^2)) I + (6t^2 / sqrt(33t^2)) j + (9t^2 / sqrt(33t^2)) k.

We can simplify T(t) by dividing each component by t^2:

T(t) = (18 / sqrt(33)) I + (6 / sqrt(33)) j + (9 / sqrt(33)) k.

The unit tangent vector of the curve R(t) for 1 ≤ t ≤ 2 is (18 / sqrt(33)) I + (6 / sqrt(33)) j + (9 / sqrt(33)) k.

To find the length of the indicated portion of the curve, we need to integrate the magnitude of the derivative of R(t) over the interval [1, 2]:

L = ∫_1^2 |dR/dt| dt = ∫_1^2 sqrt(33t^2) dt = (2 * sqrt(33) - 1 * sqrt(33)) / 2 = sqrt(33).

The length of the indicated portion of the curve is sqrt(33) units.

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The impulse experienced when a 55 kg person lands on firm ground after jumping from a height of 2.8 m is calculated to be 407.55 kg m/s.

Impulse is nothing but the term used to describe the effect of force acting over time to change the momentum of an object.

The mass of the person is given as 55 kg.

The height from which the person is jumping is 2.8 m.

The velocity before reaching the ground vf = √(2 g h) = √(2× 9.81 × 2.8) = 7.41 m/s

The impulse required to come to rest is calculated as, J = m × vf = 55 × 7.41 = 407.55 kg m/s

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The Bayes' rule may be used to determine the likelihood of an occurrence, in this example, an impending rainstorm, given another event (the dog barking).

P(A | B) = (P(B | A) * P(A)) / P is one way to express it (B)

P(A | B) is the conditional probability of event A given event B, where P(A) is the prior probability of event A (approaching thunderstorm), P(B) is the prior probability of event B (dog barking), and

The Bayes' rule may be used to determine, we may say that:

P(A) = 0.2 (20% likelihood of impending thunderstorm)

P(B | A) = 0.6 (60 percent likelihood that the dog will bark given an impending thunderstorm)

P(B) is equal to P(B | A) * P(A) + P(B | A') * P(A') which is 0.6 * 0.2 + 0.4 * 0.8 = 0.52.

As a result, given that the dog is barking, the likelihood of an impending thunderstorm is P(A | B) = (0.6 * 0.2) / 0.52 = 0.385.

Therefore, if the dog is barking, there is a 38.5% likelihood that a thunderstorm is coming.

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A.

The X velocity of the baseball: 10 m/s * cos(20 degrees) = 9.66 m/s to the right

The Y velocity of the baseball: 10 m/s * sin(20 degrees) = 3.11 m/s upwards

B.

The X velocity of the football: 0 m/s ( when thrown straight up)

The Y velocity of the football: 100 m/s upwards

C.

The X velocity of the tennis ball: 15 m/s to the right

The Y velocity of the tennis ball: 0 m/s ( when thrown off a cliff)

Velocity is described as the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time.

Velocity can be represented mathematically in the  equation

V = d/t,

where V is the velocity,

d is the distance, and

t is the time.

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139 pounds will be 63.04 kilograms

Define pounds.

The British imperial and American customary systems of measurement both utilize the pound as a unit of mass. The international avoirdupois pound, which is legally defined as exactly 0.45359237 kilograms and is divided into 16 ounces, is the definition that is currently most frequently used.

16  ounces and precisely 7,000 grains make up an  pound. A (international) grain is consequently equivalent to precisely 64.79891 milligrams because the conversion factor between the kilogram and the international pound was chosen to be divisible by 7 with a terminating decimal representation.

To convert lbs to kg, multiply the given lbs value by 0.45359237 kg

So 139 pounds will be 63.04 kilograms.

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The plane's velocity relative to the ground is 214.44 m/s Northeast.

What is velocity?

Velocity is a vector quantity that measures an object's speed and direction. It is the rate of change of an objects position over time and is measured in either meters per second (m/s) or kilometers per hour (km/h). It is calculated by dividing the distance an object has traveled by the time it took to travel that distance. Velocity is used in many fields, such as physics, mathematics, engineering, and even economics. It is an important concept as it helps us to understand the motion of objects in a given environment.

plane's velocity relative can calculated using Pythagoras theorem

v  = √a² + b²

v  = √87² + 196²

v = 214.44 m/s

Therefore, The plane's velocity relative to the ground is 214.44 m/s Northeast.

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The size of the net charge contained within the surface charge inside = total flux *ε = 0.0938*(8.85*10^-12) = 8.301*10^-13 C

Total flux = charge enclosed / ε

Therefore, you must first determine the overall flux. There is only flux via the two sides that are faced along the x axis since the E field is only in the x direction.

These faces are at x = a =0.269 m (left side of box)

and x = a+c = 0.5918 m (right side of box)

Left side of box E = 2+6*x^2 = 2+6*0.388^2 = 2.903

And the flux into the left side is E*A = 2.903*0.388*0.388 = 0.437

Now right side of box E = 2+6*0.5044^2 = 3.526

flux out of the right side is 3.526*0.388*0.388 = 0.5308

Total flux = flux out - fluxin = 0.5308 - 0.437 = 0.0938

charge inside = total flux *ε = 0.0938*(8.85*10^-12) = 8.301*10^-13 C

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A million seconds by conversion laws equal to approximately 11 days, 13 hours, 46 minutes and 40 seconds.

What are some facts related to million seconds?

A million seconds is a long time, equivalent to almost 11 and a half days.

To put it in context, here are a few historical events that happened in roughly the same time frame:

These examples illustrate the magnitude of a million seconds, which is a significant chunk of time in human history.

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The effective paraphrase of the given text is given below:

The main objective of simple machines is to reduce the amount of effort needed to perform a task by having the force act over a greater distance or longer time, making the work more efficient.

A compound machine, consisting of multiple simple machines, is less efficient due to the added friction from its many moving parts. For example, a wheelbarrow, made of a lever and a wheel and axle, and a corkscrew, made of a screw and two levers, are both compound machines.

Friction is the force that resists motion between two surfaces and all machines, including compound machines, use some of the work to overcome it. Energy cannot be created or destroyed but only converted from one form to another, according to the law of conservation of energy.

Despite having a greater mechanical advantage, compound machines are typically less efficient than simple machines due to increased friction and the need for lubricants to reduce heat.

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The S.I. unit of resistance is c. ohm. Hence the correct answer is given option c.

What is Resistance?

Resistance is a measure of the opposition of a material or device to the flow of electric current. It is expressed in ohms (Ω), and is determined by the material's electrical conductivity, as well as its physical characteristics such as length, cross-sectional area, and temperature.

Resistance results in the dissipation of energy in the form of heat, which can lead to thermal losses and reduction in the efficiency of electrical devices. In electronic circuits, resistance is used to control the flow of current and regulate voltage levels, and can be combined with other components such as capacitors and inductors to form more complex circuits.

Understanding and controlling resistance is important for the design and operation of electrical and electronic systems.

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The subway train has a constant acceleration of 1.60 m/s^2 for 14.0 s

And then runs at constant speed for 70.0 s

Before slowing down at a rate of 3.50 m/s^2 until it stops.

The final velocity, distance traveled, and time taken can be calculated using kinematic equations.

A branch of physics called kinematics, which originated in classical mechanics, defines how points, bodies, and systems of bodies move without taking into account the forces that are responsible for their motion.

When an object has either a constant velocity or constant acceleration, kinematic equations can be used to aid in problem-solving.

Kinematics is the area of classical mechanics that studies the motion of points, objects, and groups of things without taking into account the causes of motion. The Greek term "kinesis," which means motion, is where the name "kinematics" originates.

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The direction of the force is 135° counterclockwise from the +x-axis.

This can be calculated using Coulomb's Law:

[tex]F = k\frac{q1q2}{r^{2}}[/tex] , where F is the force, k is the Coulomb's constant (8.99e9 N m2/C2), q1 and q2 are the two charges, and r is the distance between them. In this case, q1 = 10 nC and q2 = -10 nC, and r = 0.3 m.

[tex]F = \frac{8.99e9 N m2/C2 * (10 nC * -10 nC) }{ (0.3 m)^{2}}[/tex]

      [tex]= -2.997e7 N[/tex]

Using the formula Fy = Fsin(θ), the y-component of the force is Fy = -2.997e7 N * sin(135°) = -2.997e7 N. The direction of the force F⃗ on the -10 nC charge is 135° counterclockwise from the +x-axis. Therefore, the direction of the force is 135° counterclockwise from the +x-axis.

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When information is encoded in atoms/molecules, the reproduction costs is nothing than it would be if the information were encoded in bits.

Molecules are:

A combination of two or more atoms from the same or different elements. When atoms of the same element are bonded together, it is called a molecular element (eg O2 or Oxygen).

If it's a matter of connecting atoms of different elements, we talk about composite molecules (e.g.

CO2 or carbon dioxide). If the smallest particles of metallic elements are atoms, then the smallest particles of non-metallic elements may be atoms or molecules. For example, the elements of the noble gas group (VIIIA) are composed of atomic particles. The halogen group elements (VIIA) consist of molecules of the element.

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The speed of the block after 3.4 m is 2.68 m/s. Speed can be defined as the change in the position of an object over time.

Speed is the rate at which an object's position changes over time.

first determine the acceleration,

Vf²- Vi²=2aΔs,

Where,

3.80 m/s is the final speed, Vf.

Initial speed for Vi is 0

s is Traveled Distance = 7.4 mm

Acceleration is A.

Fill in the values in the formula,

Vf²- Vi²=2aΔs,

(3.80 m/s)² - 0² = 2xa x6.8 mm

1.061 m/s² = a

Put the acceleration value,

Vf²- Vi²=2aΔs,- Vi²=2aΔs

Vf²= 2aΔs + Vi²

Vf² = 2x 1.061 m/s² x 3.4mm + 0²

Vf²= 7.22

Vf=2.68 m/s

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As we know that if the % of s-character increases then the bond strength gets increased.

Therefore, the increasing order of bond strength is-

1<3<2

bond (1) is formed by sp^3  hybridisation, bond (2) is formed by sp hybridisation and bond (3) is formed by sp^2 hybridisation.

As we know that if the % of s-character increases then the bond strength gets increased.

Therefore, the increasing order of bond strength is-

1<3<2

SP hybridization is a type of hybridization that occurs when an atom has one unhybridized p-orbital and two hybridized orbitals formed by the mixing of one s-orbital and one p-orbital. This results in the creation of two sp hybrid orbitals, which are directional and overlapping.

SP hybridization is often observed in compounds containing nitrogen, oxygen, or sulfur atoms with a lone pair of electrons. These atoms bond with other atoms by forming sigma bonds between their sp hybrid orbitals and the orbitals of other atoms.

rank the indicated c–h bonds according to increasing strength

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The wavelength of a wave is given by the velocity of the wave divided by the frequency:

λ = v / f

where v is the velocity of the wave (3.00 × 108 m/s) and f is the frequency (9.23 × 107 Hz). Plugging in the given values:

[tex]λ = 3.00 × 10^8 m/s / 9.23 × 10^7 Hz = 3.25 m[/tex]

So the answer is C. 3.25 m

Wavelength is a measure of the distance between two consecutive peaks or troughs of a wave. It is a characteristic property of a wave and determines its type (e.g. light wave, sound wave, etc.).

Wavelength can be calculated using the following formula:

λ = v / f

where λ is the wavelength, v is the velocity of the wave and f is its frequency. The velocity of the wave depends on the medium through which it is propagating (e.g. air, water, vacuum, etc.), while the frequency is a measure of the number of complete cycles of the wave that occur in one second.

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The example of an object with a non-zero kinetic energy is 'The International Space Station orbits the Earth' The correct option is C.

Kinetic energy is possessed by the objects which are in motion. The bodies at rest and which are in stationary position have zero kinetic energy. The SI units of kinetic energy is joule and CGS unit is erg.

Between things, kinetic energy is transmitted and has the potential to change into other types of energy.

The pendulum of the clock which is still has zero velocity, a boulder resting has zero velocity, car resting has zero velocity, a train parked has zero velocity.

The international space station orbiting the earth is in continuous motion so 'v' is a positive value and kinetic energy value is non-zero.

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Given the initial distance between the two vehicles as 3200 ft and their speeds as v_A = 65 mi/h and v_B = 40 mi/h, we can use the formula for distance and time to calculate their accelerations.

Let's call the acceleration of vehicle A as a_A and that of vehicle B as a_B.

Using the first equation of motion:

v_A = v_0 + a_A * t

v_B = v_0 + a_B * t

Where v_0 is the initial velocity and t is the time taken to reach point P and Q.

t = 40 s for A and t = 42 s for B.

We can substitute the values and solve for a_A and a_B.

When the two vehicles pass each other, their relative velocity will be zero.

Using the formula for relative velocity:

v_rel = v_A - v_B

0 = v_A - v_B

v_A = v_B

At this point, we can use either of the two vehicles' equation of motion to find the time when they meet.

Using the equation of motion for vehicle A:

x = x_0 + v_0 * t + 0.5 * a_A * t^2

Substituting the values, we can solve for t to find the time when the vehicles meet.

The speed of the vehicles at that time will be equal to v_A or v_B, whichever we have used in our calculations.

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The properties of the wave that can be determined from the given information are:

Wave velocity (v): v = d / t = 33 m / (29.4 s) = 1.12 m/s

Wave frequency (f): f = 1 / T, where T is the time for one complete wave cycle to pass a point. The time for one complete wave cycle to pass a point is not given, so the frequency cannot be determined.

Wavelength (λ): λ = v / f, where f is the wave frequency. Since the frequency cannot be determined, the wavelength also cannot be determined.

The speed at which a wave moves through any medium is known as its phase velocity. This is the speed at which any particular frequency component of the wave moves in phase. Any particular wave phase will seem to move at the phase velocity for such a component.

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z = 2(x² + y²)  is an equation for the surface consisting of all points p for which the distance from p to the x-axis is twice the distance from p to the yz-plane.

This equation represents a surface consisting of all points p for which the distance from p to the x-axis is twice the distance from p to the yz-plane. To understand this equation, it is helpful to consider the x-axis and the yz-plane as two distinct points in space. The distance from p to each of these points is simply the length of the line segment from p to each of the two points.

The equation states that the distance from p to the x-axis should be twice the distance from p to the yz-plane. This can be expressed mathematically by setting the distance from p to the x-axis equal to twice the distance from p to the yz-plane. This can be represented as a formula, z = 2(x² + y²), which is the equation for the surface. The x and y coordinates of a point p determine its distance from the x-axis and yz-plane, respectively, so these coordinates are squared and added together to get the equation.

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The magnitude and direction of the acceleration when the car is at point B is  0.24 m/s^2  magnitude and  the angle is,145^0 counterclock wise from + x axis

For illustration, imagine you are in a car at a stoplight and you start to accelerate. Let's say you accelerate to a speed of 20 ms in 2 s. This indicates that you are accelerating at a rate of a=20ms2s=10ms2. Your speed therefore changed by 20 ms every two seconds, or 10 ms per second. In uniform circular motion, the acceleration is along the radius and in the direction of the center. Acceleration has magnitude and direction as a vector quantity. The object's speed, direction of motion, and the direction of acceleration all affect which way it accelerates. Generally speaking, an object will accelerate in the same direction as its motion if it is speeding up.

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