Question

bus running at a speed of 18 km per hour is stopped in 2.5 seconds by applying brakes calculate the retardation produced

Answer 1

initial velocity = 18 km/h = 18×5/18 m/sec

= 5 m/sec

[ km/h = 5/18 m/sec ]

final velocity = zero

acceleration = change in velocity/time

= ( final velocity - intial velocity)/time

= ( 0 - 5)/2.5 = -2 m/s²

so, retardation = 2m/s²

Hope it helps