work done by coolie is
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Work done by coolie is zero because normal farce acts
abhinavrisingstar:
coolie
its zero
no
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1. The work done by a coolie walking on levelled road with load on his head is zero
2. The work done is zero when, the direction of displacement and the direction of force on a body are perpendicular to each other because the load from his head does not move away from his head.
Mathematically,
work done = force × distance
= force × 0 [distance = 0 because load does not move from his head]
= 0
therefore work done = 0
wrong
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