Question

A bus running at a speed of 18km /hr is stopped in 2.5 by applying brakes .calculate the retardation produced

Answer 1

Its simple,Initial Velocity= 18 km/hour. Final velocity= 0 (because the car stops.) Time= 2.5 seconds.

acceleration= (v-u/)t

                       = 0 - 5 / 2.5 

                       = -2 m/s2