Question

You are driving to the grocery store at 18.2 m/s. You are 120.0 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.270 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply the brakes?

Answer 1

You travel 18.2 m/s * 0.27 s = 4.9 m during your reaction time. You will be that much less than 120 m from the intersection when the brakes are applied.

Answer 2

thank you :)