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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.

Q. 13.     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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Since there was no displacement thus the work done by man is zero. This work should not be considered relatable to the term 'work' we use in daily life.

Due to upholding the weigth against gravity led the man get tired. 

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