A car sits in an entrance ramp to a freeway, waiting for a break in the traffic.

Question

A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line, and has a speed of 21.0m/s when it reaches the end of the ramp, which has length 118m . Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up Provide FeedbackContinue A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line, and has a speed of 21.0m/s when it reaches the end of the ramp, which has length 118m . A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line, and has a speed of 21.0m/s when it reaches the end of the ramp, which has length 118m . A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line, and has a speed of 21.0m/s when it reaches the end of the ramp, which has length 118m . A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves in a straight line, and has a speed of 21.0m/s when it reaches the end of the ramp, which has length 118m . Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up Provide FeedbackContinue Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up Part A What is the acceleration of the car?   a =   m/s2   SubmitMy AnswersGive Up   a =   m/s2     a =   m/s2   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up Part B How much time does it take the car to travel the length of the ramp?   t =   s   SubmitMy AnswersGive Up   t =   s     t =   s   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up Part C The traffic on the freeway is moving at a constant speed of 21.0m/s . What distance does the traffic travel while the car is moving the length of the ramp?   L =   m   SubmitMy AnswersGive Up   L =   m     L =   m   SubmitMy AnswersGive Up Provide FeedbackContinue   a =   m/s2  

Explanation / Answer

1) V^2 - U^2 = 2aS

21^2 - 0^2 = 2 a x 118

a = 1.868 m/s^2

2) V = u + at

21 = 1.868 x t

t = 11.24 s

3) L = 21 x 11.24

L = 236.04 m

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