A person keeps a sac of rice on his head for 30 minutes & gets tired .Has he clone any work ? Explain your answer with reason .
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Answer:
no, work is not done in this case
Explanation:
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Gravitational force on the box is acting in the downward direction. Since the boy walks horizontally, his vertical displacement is zero. Hence, when a boy carrying load on his head moves over a horizontal road, work done against gravitational force is zero.
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