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 Q 1 (d)  The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: work done by an applied force on a body moving on a rough horizontal plane with uniform velocity

 

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In this case, the applied force supports the motion of the object (balances frictional force). Thus work done by the force is positive.

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Devendra Khairwa

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