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Car Velocity Question

  • Thread starter bns1201
  • Start date
  • #1
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Homework Statement


Part 1 Consider a car which is traveling along a straight road with constant acceleration a. There are two checkpoints, A and B , which are a distance 81.4 m apart. The time it takes for the car to travel from A to B is 5.89 s.

Part 2 Find the velocity VB for the case where the acceleration is 7.45 m/s^2.

The Attempt at a Solution


acceleration multiplied by the final time does not give me the answer
 
Last edited:

Answers and Replies

  • #2
danago
Gold Member
1,122
4
What is VB? Is that supposed to be the velocity once it reaches checkpoint B?
 
  • #3
22
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yea my browser won't load the functions so it should read V(sub)B which is the velocity once it reaches checkpoint B.
 
  • #4
danago
Gold Member
1,122
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Perhaps start by finding what the velocity at checkpoint A is.
 
  • #5
22
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how would you go by doing that?
 
  • #6
22
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anyone? I have no clue how to find the velocity at either checkpoints with the given data
 
  • #7
Delphi51
Homework Helper
3,407
10
Take A to be the initial point, time = 0.
Then for the trip to B you know d, t, and a. Don't know Vi.
You could make progress with d = Vi*t + 0.5a*t^2 which has only one unknown.
There is another formula like that with a Vf instead of a Vi which would get you to the answer in one step.
 

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