Physics High School

The driver of a car slams on the brakes, causing the car to slow down at a rate of
20.0ft/s as the car skids 295ft to a stop.
How long does the car take to stop?
What was the car’s initial speed?

The Driver Of A Car Slams On The Brakes, Causing The Car To Slow Down At A Rate Of20.0ft/s As The Car

Answers

Answer 1

Answer:

The time taken for the car to stop is 5.43 s.

The initial velocity of the car is 108.6 ft/s

Explanation:

The following data were obtained from the question:

Acceleration (a) = –20 ft/s² (since the car is coming to rest)

Distance travalled (s) = 295 ft

Final velocity (v) = 0 ft/s

Time taken (t) =?

Initial velocity (u) =?

Next, we shall determine the initial velocity of the car as shown below:

v² = u² + 2as

0² = u² + (2 × –20 × 295)

0 = u² + (–11800)

0 = u² – 11800

Collect like terms

0 + 11800 = u²

11800 = u²

Take the square root of both side

u = √11800

u = 108.6 ft/s

Therefore, the initial velocity of the car is 108.6 ft/s.

Finally, we shall determine the time taken for the car to stop as shown below:

Acceleration (a) = –20 ft/s² (since the car is coming to rest)

Final velocity (v) = 0 ft/s

Initial velocity (u) = 108.6 ft/s

Time taken (t) =?

v = u + at

0 = 108.6 + (–20 × t)

0 = 108.6 + (–20t)

0 = 108.6 – 20t

Collect like terms

0 – 108.6 = – 20t

– 108.6 = – 20t

Divide both side by –20

t = – 108.6 / –20

t = 5.43 s

Therefore, the time taken for the car to stop is 5.43 s.

Related Questions

A rock is thrown downward from the top of a cliff with an initial speed of -13m/s.If the rock hits the ground after 2.7 s, what is the height of the cliff

Answers

Answer:

0.62 m down.

Explanation:

Use the formula d= vi*t +1/2 at^2

So the initial speed or vi is -13 m/s and time is 2.7 s and a or acceleration is 9.8 m/s^2 down ( because it's the gravity). So you plugged all the values and you will get 0.62 m. We put the down because the acceleration is saying down. Because displacement is vector quantity you have to show the direction of it.

Choose Yes or No to tell if the number 9.81 will make each equation true.



12.47 – □ = 2.66

8.05 + □ = 17.96

14.08 – □ = 4.17

3.67 + □ = 13.48

Answers

Answer:

yes

no

no

yes

Explanation:

An 8000.0 kg truck starts off from rest and reaches a velocity of 18.0 m/s in 6.00 seconds. What is the truck’s acceleration and how much momentum does it have after it has reached this final velocity?

Answers

Explanation:

Acceleration is change in velocity over time.

a = Δv / Δt

a = (18.0 m/s − 0 m/s) / (6.00 s)

a = 3.00 m/s²

Momentum is mass time velocity.

p = mv

p = (8000 kg) (18.0 m/s)

p = 144,000 kg m/s

When an 8000.0 kg truck starts off from rest and reaches a velocity of 18.0 m/s in 6.00 seconds then the truck’s acceleration would be 3 m/s² and the momentum after it has reached this final velocity would be 144000 kgm/s.

What is momentum?

It can be defined as the product of the mass and the speed of the particle, it represents the combined effect of mass and the speed of any particle, and the momentum of any particle is expressed in Kg m/s unit.

Mathematically the formula of the momentum is

P = mv

where P is the momentum of the particle

m is the mass of the particle

v is the velocity by which the particle is moving

As given in the problem An 8000.0 kg truck starts off from rest and reaches a velocity of 18.0 m/s in 6.00 seconds

By using the first equation is given as follows

v = u + at

18 =0 + a×6

a = 3 m/s²

As given in the problem the final velocity of An 8000.0 kg truck is 18 m/s

the momentum is given by the formula

P = mv

P= 8000×18

P = 144000 kgm/s

Thus, the truck’s acceleration would be 3 m/s², and the momentum after it has reached this final velocity would be 144000 kgm/s.

Learn more about momentum from here

brainly.com/question/17662202

#SPJ5

Which of the following statements are true

Answers

Answer:

none of them

Explanation:

Answer:

Did u forget to add a pic?

Explanation:

What type of force occurs when one object pushes or pulls a second object while they
are touching?

Answers

★・・・・・・★・・・・・・★・・・・・・★・・・・・・★・・・・・・

»Answer

【Contact forces involve push, pull and friction. A contact force is when two interacting objects are touching, for example: when you throw a ball you are using a contact force.】

hope it helps

can u give a thanks

thank you

★・・・・・・★・・・・・・★・・・・・・★・・・・・・★・・・・・・

Other Questions
The barrel of a fountain pen, cylindrical in shape, is 7 cm long and 5 mm in diameter. A fullbarrel of ink in the pen is used up on writing 3300 words on an average. How many words canbe written in a bottle of ink containing one fifth of a litre? When making a decision, you should consider the _____good things that can happenconsequencesemotion i need help with my 8th grade math 7. What is the tone of the following passage? "The room was dark and cold. Cobwebs covered the dustyfurniture, and there was a black cat hissing in the bleak darkness."O concernedO frighteningO suspiciousO inviting What did both sides (Federalist and anti-federalist)one to protect America from? 26 points Read the paragraph. Choose the BEST meaning of "didn't let it ruffle her feathers" The linear function graphed below represents Brendas monthly cell phone bill based on the number of hours she uses. What is her hourly rate? Please help im suppose to rewrite them Skills and training requirements of being an orthodontist Solve for the value of z.(5z-4) 39 The johnsons just moved into their new home and are selecting furniture for the family room Which type of informational text reports on local current events?instructional manualsgraphic aidstextbooksnews articles Read this excerpt from The Riddle of the Rosetta Stone by James Cross Giblin. Between the time Champollion's books appeared and the end of the nineteenth century, thousands of rolls of papyrus and copies of temple and tomb inscriptions were brought to Europe and America. There scholars, using the deciphering methods Champollion had pioneered, traced the entire history of writing in Egypt. They discovered it had begun about 3100 B.C. when images of important people were first accompanied by hieroglyphs of their names or titles. By 2500 B.C. complete sentences began to appear on tomb inscriptions, along with lists of offerings to the Egyptian gods. Which statement best expresses an inference that can be supported by information in the excerpt? A. Ancient Egyptian writing became more complex over time. B. The only writing discovered from ancient Egypt was written on tombs. C. Only wealthy people had tomb inscriptions in ancient Egypt.D. Most of the Egyptian writing that scholars translated was about Egyptian gods. Factor each completely. 10a - 9a + 2 Sophie is using context clues with her new reading assignments. What results should she expect to see? Check all that apply. Activity 1: "Describe Me"Instruction: Based on the vocal and instrumental music you have listened, describe themusical characteristics of Medieval, Renaissance and Baroque musicPeriod Vocal InstrumentalMedievalRenaissanceBaroque Can I please have a bit of help with this? Thank you. 1) "No territrio brasileiro, as estruturas e as formaes litolgicas so antigas, mas as formas do relevo so recentes. Estas foram produzidas pelos desgastes erosivos que sempre ocorreram e continuam ocorrendo, e com isso esto permanentemente sendo reafeioadas". (ROSS, J. S. (org). Geografia do Brasil. 5 ed. EdUSP, 2005. P.45). Conforme as descries realizadas pelo texto acima, o relevo brasileiro de origem antiga, sendo muito trabalhado pelos agentes exgenos (internos) de modelagem. Essa dinmica implica: a) na constituio de formaes orogenticas b) nas zonas de planalto ao longo do leito do rio Amazonas c) na existncia de imensas reas de plancie d) na elevada amplitude altimtrica do pas e) na ausncia de cadeias montanhosas no territrio nacional What is the y-intercept of the quadratic functionf(x) = (x - 6)(x - 2)? What is the correct order for.the three steps of the scientific method ?