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A wooden chair is dragged on the level f...

A wooden chair is dragged on the level floor and brought to the same place. Let the distance covered be 's' and frictional force acted on the chair by the floor be 'f' . What is the work done by the frictional force

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Assertion :- Work done is positive when force acts in the direction of displacement. Reason :- Work done by frictional force can not be positive.

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