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
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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
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