Question

A car is moving with speed u driver of the car cigarette traffic light reaction time is t then find out the distance travelled by the car after the incident when driver decided to apply brakes assume uniform retardation after applying brakes

Answer 1

During the duration of reaction and application of brake the car is still in uniform velocity..... So distance traveled will be

D1 = u * t

Later as deceleration is applied distance covered before coming to rest is

V^2 = u^2 + 2*a*D2 (here v = 0)

So total distance will be D1+D2

Answer is ut+u^2 /2a

Answer 2

Answer:

See the attachment below