Question

F acts always such that it is tangential to the surface of hill find the work done by force F

Answer 1

Answer:

Assuming body moves with constant velocity.

Let us consider a very small part of journey where mass m travels 'ds' along hypotenuse with its base 'dl' and perpendicular 'dh'.

For small part, trajectory is approximately straight / flat without curve.

Answer 2

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Force F acts such that it is always tangential to surface of hill(rough). Find work done by force. A body of mass m is slowly hauled up a rough hill as shown in fig by a force F which acts tangential to the trajectory at each point.