How to Solve Distance Question

Question

A driver with a 0.80-s reaction time applies the brakes, causing the car to have acceleration opposite the direction of motion. Assume the acceleration is equal to -7.0 m/s2.

If the car is initially traveling at 26 m/s, how far does the car travel during the reaction time?

Answer 1

Hi Kennedy,

During the reaction time, the brakes are NOT being applied, so the car is still moving at its intial speed (for 0.80 seconds).

d = vt

d = (26 m/s)(0.80 s)

d = 20.8 m (21 m is you have to use two significant figures)