Question

A motorist, traveling at the 120km/hr sees a broken down truck at the middle of the road and immediately applies his brake and comes to stop with uniform retardation in 20 secs. What distance does the car travel after the brakes were applied?

Answer 1

Given:

$v_i=\rm 120 \:km/h=33.3\: m/s$

$v_f=0$

$t=20\:\rm s$

The distance traveled by a car

$$d=\frac{v_i+v_f}{2}t=\frac{33.3+0}{2}*20=333\:\rm m$$