a child is moving on a skateboard at the speed of 2 m/s .after a force acts on him ,his speed become 3 m/s.find the work done by external force on given the mass of child20 kg
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Answer:
From Work Energy Theorem,
Work done = Change in KE
W = 1/2mv^2 - 1/2mu^2
= 1/2*20*9 - 1/2*20*4
= 1/2×20(9-4)
= 10×5 = 50 J
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