Question

A driver of car takes 0-20s (which is the reaction time of driver )to apply the brakes after he sees an obstruction at a distance of 25m from him. If he is driving car at a speed of 54km/h and the brakes cause a deceleration of 6-0m/s2,predict whether he will avert collision or not
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Answer 1

Answer:

u=15m/s

In 20 s he will travel dist = 15×20= 300m

definitely will collide

he decel. at 6m/s2

v^2-u^2=2as

S= -225/-12=18.75 m