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

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Question.
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.

Solution:
The person does no work because, no displacement takes place in this case.

A person holds a bundle of hay over his head for 30 minutes and gets tired.