Question

A block of mass 200gm is moving with a velocity of 72kmph is brought to rest by
applying brakes in 20 seconds. Find the force exerted by brakes on wheels
(l​

Answer 1

since retardation is happening so

a = (u-v)/t = {(72×1000/3600) / 20}m/s² = 1 m/s²

F=ma = (200/1000)N = .2 N