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What is work done in holding a 15kg suitcase while waiting for a bus for 15 minutes?

CLASS - XI PHYSICS (Work, Energy and Power)



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The man is holding the suitcase at the same height above the surface of earth. So the gravitation potential energy remains the same. 

workdone is force * displacement = weight * 0 = 0

0 0 0
displacement of suitcase is 0. so work done is zero.
actually the muscles stretch a little.. so some work is done.
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