You are driving a car 31mi/h down the road. The stoplight in front of you sudden

Question

You are driving a car 31mi/h down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 18.5m meters. (Assume positive x to be in the forward direction) Part A What is the velocity of the car in meters per second? Part B What is the acceleration of the car? Part C If your car were going twice the velocity, how far would it take to stop if the acceleration were the same as for part (B)? Part D How long would it take the car to stop if it were going at twice the velocity?

Explanation / Answer

a)31 mi/h = 13.85824 meters / second b) 0 = u^2 + 2as a =-5.19 m/s^2 c) 4u^2 = 2as s = 74 m d) 0 = 2u -at t = 1.335 s

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