Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it. (a) How much work is done by the men in lifting the box? (b) How much work do they do in just holding it? (c) Why do they get tired while holding it? (g = 10 m s⁻²)

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CASE_STUDIESConditions for Work to be DoneWork Done Against GravityNCERT Exemplar3 sub-questions

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