An object of mass m slides down a hill of arbitrary shape and after travelling a certain horizontal path stops because of friction. The total vertical height descended is h. The friction coefficient is different for different segments for the entire path but is independent of the velocity and direction of motion. The work that a tangential force must perform to return the object to its initial position along the same path is

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mgh

-mgh

-2 mgh

2mgh

answer is D.

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Detailed Solution

The initial potential energy of the object is mgh, which has been used up for work against the force of friction. In returning the body to its initial position, the force performs the same work against friction. In addition, it imparts to the object the initial potential energy. As a result, the total work will be 2mgh.

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