Question

2. A car is travelling at 30.0 m s-1 when the driver needs to stop suddenly. If the driver takes 0.250 s (the reaction time) to apply the brakes, and the maximum deceleration of the car is 8.00 m s-2. Determine the total stopping time

Answer 1

4.00 s

Step-by-step explanation:

Given:

u = 30.0 m/s

v = 0 m/s

a = -8.00 m/s²

Find: t

v = at + u

0 = (-8.00) t + (30.0)

t = 3.75 s

It takes 3.75 seconds from the time the driver brakes to stop the car.

Add the 0.250 reaction time, and the total time is 4.00 seconds.