Calculate the amount of work required to stop a car of 1000 kg moving with a speed of 72 km h”1?
Thursday, March 17, 2022
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Question: Calculate the amount of work required to stop a car of 1000 kg moving with a speed of 72 km h”1?
Initial speed =72 km/h = 72×5÷18
=20 m/sec.
final velocity v=0
mass m=1000 kilograms
Work done to stop it
W=K.E i - K.E f
W=1/2mu2 -1/2 mv2
W=1/2 ×1000 (20)2 -0
W=2× 10 5 J
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