Question

A person holds a bundle of hay over his head for 30 min and get tired.has he done some work.justify your answer.

Answer 1

the work done by man will be 0joule because force is perpendicular and displacement is0

Answer 2

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The person applies a force on the bundle of hay in the upward direction but there is no displacement of the load.

We know, W = F × s.
Since, s = 0, W = 0.

So, work done by the person on the bundle of hay is zero.

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Thanks...✊