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

Question

vikas askiitian expert · Answer

applying work energy theorem

change in kinetic energy = work done by all forces

= W_mg + W_ext

work by gravity = -mgh (-ve sign is because work is done against gravity)

work by F is W_ext

change in kinetic energy = 0

so

W_ext - mgh = 0

W_ext = mgh

so work by force F is mgh , this work will not depend on the angle of incline ......

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

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

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