A person holds a bundle of hay over his ...

A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not ? Justify your answer.

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A person holding a bundle of hay over his head for 30 minutes has done no work because he has not moved the bundle over some distance (s = 0). The person gets tired due to muscular fatigue. This is because his muscles are stretched and blood is displaced to the strained muscles more rapidly. These, changes consume energy and he feels tired.

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