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Q.

A body of mass m was slowly pulled up the hill by a force F which at each point was directed along the
tangent of the trajectory. All surfaces are smooth. Find the work performed by this force.

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a

zero

b

mgl

c

mgh

d

$-$ mgl

answer is C.

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Detailed Solution

$∴ W_{F} + W_{g} = Δ K = 0 \Rightarrow W_{F} = - W_{g} = m g h$

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