https:// mastering physics.com Session PHY 11 Fall 2015 Homework #05 phy 111 Pro

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https:// mastering physics.com Session PHY 11 Fall 2015 Homework #05 phy 111 Problem 2.37: Entering the freeway. Problem 2.37: Entering the freeway 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 15.0 m/s when it reaches the end of the ramp, which has length 119 m Mastering Physics: Homework #05 (phy 111) Google Chrome Help Close Signed in a Resources previous l 6 of 9 l next What is the acceleration of the car? a 2.648 mm/S Submit My Answers Give U Incorrect, Try Again, 9 attempts remaining Part B How much time does it take the car to travel the length of the ramp? Submit My Answers Give U Part C The traffic on the freeway is moving at a constant speed of 15.0 m/s. What distance does the traffic travel while the car is moving the length of the ramp?

Explanation / Answer

speed , v = 15 m/s

length of ramp , L = 119 m

a) using third equation of motion

v^2 - u^2 = 2 * a * d

15^2 - 0 = 2 * a * 119

solving for a

a = 0.945 m/s^2

the accelertion of car is 0.945 m/s^2

b)

using first equation of motion

v= u + a*t

15 = 0.945 m/s^2 * t

t = 15.87 s

the time taken is 15.87 s

C)

distance = speed * time

distance = 15 * 15.87 m

distance = 238 m

the traffic on free way moves 238 m

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