A sled starts off with an initial velocity of 8 m/s and slows down to 2 m/s after 3 seconds. What was its acceleration?

Answers

Answer 1

Answer:

-2m/s

Explanation:


Related Questions

Two rocks of masses 5 kg and 10 kg a dropped from rest from a height of 20 m above ground. Ignore all friction and air resistance. Just before
they hit the ground, which statement is true about the rocks?
(A) The value for the acceleration of the 5 kg rock is the same as the value for the 10 kg rock, but their velocity values are different.
(B) The values for the acceleration and velocity of the 5 kg rock are greater than the values for the 10 kg rock.
(C) The values for the acceleration and velocity of the 5 kg rock are less than the values for the 10 kg rock.
(D) The values for the acceleration and velocity of the 5 kg rock are the same as the values for the 10 kg rock.

Answers

Answer:

D

Explanation:

F=ma

F of 5 kg rock = 49N

F of 10 kg rock = 98 N

Divide by respective masses to get acceleration, and of course you will get 9.8 m/s^2 for both.

Now, use potential energy equals kinetic energy. mgh=(1/2)mv^2 mass cancels out of the equation, since it's on both sides, so we can stop right there. We have algebraically determined that mass does not affect acceleration or velocity!

Hope this helped.

What is the object’s average acceleration between 0.0 s and 5.0 s?
ANSWER FAST! PLEASEE

Answers

Answer:

[tex]2.5[/tex]

Explanation:

[tex]0.0+5.0=5.0[/tex]

[tex]\frac{5}{2} =2.5[/tex]

hope this helps!!!!!!!!!!

Why is ultraviolet radiation considered more dangerous to humans than infrared radiation?
ANSWER:Ultraviolet radiation has a shorter wavelength than infrared radiation, and thus, the waves have higher energy. This allows them to penetrate the first layers of skin on humans and can mutate the DNA in the cells of the skin. This can result in cancer because of the mutations caused by the ultraviolet radiation.

Answers

answer is in the question :)

If a ball that is 10 meters above the ground is thrown horizontally at 5.51 meters per second. a. how long will it take for the ball to hit the ground? b. how far will the ball travel in the horizontal direction before it hits the ground?​

Answers

Answer:

a. t = 1.43 s

b. d = 7.88 m

Explanation:

a. The time of flight can be found using the following equation:

[tex] y_{f} = y_{0} + v_{0_{y}}t - \frac{1}{2}gt^{2} [/tex]

Where:

[tex]y_{f}[/tex]: is the final height = -10 m

[tex]y_{0}[/tex]: is the initial height = 0

[tex]v_{0_{y}}[/tex]: is the initial speed in the vertical direction = 0

g: is the acceleration due to gravity = 9.81 m/s²

By solving the above equation for "t" we have:

[tex] t = \sqrt{\frac{2y_{f}}{g}} = \sqrt{\frac{2*10 m}{9.81 m/s^{2}}} = 1.43 s [/tex]

Hence, the ball will hit the ground in 1.43 s.

b. The distance in the horizontal direction can be found as follows:

[tex] x_{f} = x_{0} + v_{0}t + \frac{1}{2}at^{2} [/tex]

Where:

x₀: is the initial position in the horizontal direction = 0

a: is the acceleration in the horizontal direction = 0 (it is moving at constant speed)

[tex] x_{f} = 5.51 m/s*1.43 s = 7.88 m [/tex]

Therefore, the ball will travel 7.88 m before it hits the ground.

I hope it helps you!

Which is NOT an example of evidence that shows a chemical reaction occurred?
change in color
change in temperature
change in shape
bubbles, fizzing

Answers

Change in color
Change in color is a physical reaction

Solve for the gravitational potential energy at point B.

Use the steps below to show all your work for full points

Acceleration due to gravity =9.8 m/s/s

GPE = m*g*h​

Answers

Answer:

GPEb=67.86% of initial GPE at point a

Explanation:

It depends on how massive the ball is, but I can still give an answer comparing original GPE at point A to new GPE at B

GPEa=m*9.8*140

GPEa=1372(m)

GPEb=m*9.8*95

GPEb=931(m)

GPEb=0.6786*GPEa

a force of 25N acts on an object. The work done by the force is 400J. How far dose the object move in the direction of the force?

A. 6.3cm
B. 16cm
C. 16m
D. 10km​

Answers

Answer:
C
Explanation:
d=w/f
d=400/25
d= 16

The distance moved by the object in the direction of the force is equal to 16 m. Therefore, option (B) is correct.

What is the work?

Work can be demonstrated as the energy employed when a force is exerted to move an object through a specific distance. The work done depends upon both the exerted force on the object and the displacement.

The action of the force when the object is moving in a straight line in the direction of the exerted force over a distance 'd'.

W= F ×d

Where 'd' is the displacement, 'F' is the applied force and W is the work done.

Given, the work done by the applied force, W = 400 J

The force applied on the object, F = 25 N

The distance moved by the object, d = W/F

d = 400/25

d = 16 m

Therefore, the object moves a distance of 16 m in the direction of the force.

Learn more about work, here:

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How are defenders on a baseball team positioned ?

Answers

Answer:

1 (pitcher), 2 (catcher), 3 (first baseman), 4 (second baseman), 5 (third baseman), 6 (shortstop), 7 (left fielder) 8 (center fielder), and 9 (right fielder)

Explanation:

There are nine fielding positions in baseball. Each position conventionally has an associated number, for use in scorekeeping by the official score

there’s 3 outfield , and the rest are infield !

Help Easy Question and Brainly. What's the answer?????

Answers

Answer:

negatively

Explanation:

Answer:

Negatively charged

Explanation:

PLS ANSWER MY QUESTION TOO

Shrill sound is of -------------- *

Higher frequency
Lower frequency
Higher amplitude
Lower amplitude

Answers

Answer:

Higher frequency.

Explanation:

Sound are mechanical waves that are highly dependent on matter for their propagation and transmission.

Sound travels faster through solids than it does through either liquids or gases. A student could verify this statement by measuring the time required for sound to travel a set distance through a solid, a liquid, and a gas.

Mathematically, the speed of a sound is given by the formula:

[tex] Speed = wavelength * frequency [/tex]

Generally, the frequency of a sound wave determines the pitch of the sound that would be heard.

A shrill sound refers to a type of sound that is typically sharp, high pitched and as such has higher frequency.

Hence, shrill sound is of higher frequency.

15. How mh energy does a 850W microwave transfer reheating a meal for 30s?

Answers

Answer- is 10000000000

Answer: 25500 joules

Explanation: E = P x t

(Cr(NH3).](Co(CN)6) is a coordination complex
compound. What is the percent composition of carbon in this
compound?

Answers

Answer:19.51%

Explanation:

If anyone can answer any of these questions it would be so amazing. My teacher for physical science didn't do a good job explaining it and I don't have enough time to teach it to myself.

Answers

Answer:

H,ONCIC1N,ONHCOQ,OH2HOO2CO2NH2N2,OC,O2NO2 N,O

a car is traveling north on the interstate. They cover 645 miles in 9 hours. What is the car's average velocity ?

Answers

Answer:

71.6 mph

Explanation:

you would do 645 divided by 9 which would give you 71.6

Which law best describes this behavior of gases in the Sun?

Answers

Answer:

The extreme pressure from the weight of the gases that make up the Sun raises the temperature of the core enough for the nuclear reactions to take place, Which law best describes this behavior of gases in the Sun? A. Charles law.

Explanation:

if it is helpful....... plzz like and follow

What is the speed of a rocket that travels 10000 meters in 15 seconds?
Help a brother out

Answers

Answer:

666.67

Explanation:

the formula is speed = distance ÷ time

by the way I approximated the answer hope that it help I'm not sure it's right but I hope it is.

Newton’s Second Law of motion says that the acceleration of an object is related to the force and mass of the object. This equation is used to describe the relationship: F=ma, where f is the force, a is the acceleration, and m is the mass for the object in motion.

If a ball starting at rest has a mass of 0.25 kilograms and is pushed with a force of 3.5 N, then what is the acceleration for the object from the applied force? SHOW YOUR WORK.

Answers

Answer:

14metre squared

Explanation:

acceleration=force/mass

A 5 kg object is moving downward at a velocity of 12 m/s and is
currently 2.6 meters above the ground.

calculate its kinetic energy
calculate its potential energy
calculate its mechanical energy

Answers

Answer:

the first one i think

Explanation:

What is the speed of a rocket that travels 9,000 meters in 12 seconds?

Answers

9,000/12=750

Speed is equal to distance divided by time
742.57 m/s .............

The least penetrating form of radiation is
X rays
gamma radiation
ОООО
alpha radiation
beta radiation

Answers

Answer:

radio radiation........

Answer

C.( Alpha particles!

A piece of metal has a volume of 2.0 x 10-5 m3.
The density of the metal is 8.0 x 103 kg/m3.
What is its mass?
A. 2.5 103 kg
B.4.0 x 102 kg
C.1.6 101 kg
D.1.6 x 105 kg

Answers

Anwser- A

Hope it helps

HELPPPPPPP MEEEEEEE ASAP PLZZZZZZZZZ

Answers

the answer is 24 atoms.

Atoms are made up of even smaller particles called ?

Answers

Answer:

Atoms are made up of even smaller particles called protons, electrons & neutrons (sub-atomic particles)

Atoms are made up of smaller particles called subatomic particles.

What is an Atom?

An atom is defined as the smallest indivisible particle of an element. It is made of subatomic particles which are:

NeutronProton Electron

Now the Neutron and Proton make up the nucleus which is at the core(middle) of the atom whole the electron rotates around the orbits that  surrounds the nucleus.

The Neutron has no charge.

The Proton is positively charged.

The electron is negatively charged.

Learn More about Atoms here:https://brainly.com/question/14214017

Why does the moon appear to change its shape as seen from Earth

A.Different parts of the sunlit moon become visible as the moon revolves around the Earth

B.Different parts of the moon are lit as the moon rotates

C.The moon moves farther and then closer to Earth

D.The sun lights different parts of the moon during different seasons

Answers

Answer:

Explanation:

Why does the moon appear to change its shape as seen from Earth

which one of the following forces is a contact force force of gravity or force of friction​

Answers

:Force. of friction:

Classify each substance as either a conductor or insulator.

A sample of mercury:
✔ conductor

A piece of glass:
✔ insulator

A rubber hose:
✔ insulator

A negatively ionized lithium paste:
✔ conductor

Answers

The correct classification of each substance is as follows:

A sample of mercury: conductorA piece of glass: insulatorA rubber hose: insulatorA negatively ionized lithium paste: conductor

What are conductors and insulators?

A conductor is a substance that can transmit electricity, heat, light or sound while an insulator is a substance that does not transmit heat, sound or electricity.

Conductors are usually metals while insulators are usually non-metals. Examples of conductors include;

IronAluminumCopper

Examples of insulators include;

GlassPaperWoodSilk

Therefore, the correct classification of each substance is as follows:

A sample of mercury: conductorA piece of glass: insulatorA rubber hose: insulatorA negatively ionized lithium paste: conductor

Learn more about conduction at: https://brainly.com/question/18084972

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Answer:

Explanation:

E2020

Help Please I will Give The Brainliest! (SCIENCE)

Answers

Answer:

2.

Hope this will help you.

How do plants obtain the carbon dioxide required for photosynthesis?​

Answers

Answer:

Explanation:

Carbon dioxide in photosynthesis Plants get carbon dioxide from the air through their leaves. The carbon dioxide diffuses through small holes in the underside of the leaf called stomata . (singular: stoma. plural: stomata) The lower part of the leaf has loose-fitting cells to allow carbon dioxide to reach the other cells in the leaf.

Answer:

Plants get the carbon dioxide they need from the air through their leaves. It moves by diffusion through small holes in the underside of the leaf called stomata These let carbon dioxide reach the other cells in the leaf, and also let the oxygen produced in photosynthesis leave the leaf easily.

Hope I can help you

Warm air rises because it has less ___________.

Answers

Answer:

because it is less dense than the surrounding air

Explanation:

All matter is made up of very small particles called. ?

Answers

Answer:

All matter is made up of very small particles called atoms.

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