A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
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Answer: No , he doesn't perform the work against the gravity.
Explanation: He applied force against gravity , but the luggage wasn't displaced . So that's why he hasn't perform any work .This is because we have studied that work done is always when we apply force on the object and the object get displaced from it's position.
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