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In which of the following, the work done by the mentioned force is negative? The work done by

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The tension of the cable while the lift is ascending

The gravitational force when a body slides down an inclined plane

The applied force in maintaining uniform motion of a block on a rough horizontal surface

The gravitational force when a body is thrown up

answer is D.

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Detailed Solution

When a body is thrown up the gravitational force acts opposite to the displacement of the body. The work done being a dot product of force and displacement vectors, becomes negative as cosine of 180 degrees is -1.

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