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Alpha Biswas Grade:
        

 




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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7 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

applying work energy theorem


change in kinetic energy = work done by all forces


                                   = Wmg + Wext 


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


work by F is Wext


change in kinetic energy = 0


so


        Wext - mgh = 0


       Wext = mgh


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

7 years ago
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