A solid spherical ball is released from rest on an incline of inclination angle theta (which can be varied ) but through a fixed vertical height h. The coefficient of static and kinetic friction are both equal to mu. If E represents the total kinetic energy of the ball at the bottom of the incline as a function of the angle of inclination theta. W represents the work done by friction for the whole time of motion as a function of the angle of inclination theta. Choose of correct graph (s)

A solid spherical ball is released from rest on an incline of inclinat

1.	A solid spherical ball is released from rest on an incline of inclination angle theta (which can be varied ) but through a fixed vertical height h. The coefficient of static and kinetic friction are both equal to mu. If E represents the total kinetic energy of the ball at the bottom of the incline as a function of the angle of inclination theta. W represents the work done by friction for the whole time of motion as a function of the angle of inclination theta. Choose of correct graph (s)
Answer» SOLUTION :For small angle of inclinations, ball rolls without SLIPPING. So there is no work done by FRICTION. At some critical angle `theta_(C)`, the ball starts slipping. For `thetagt theta_(C)` energy WOULD be lost due to work done by kinetic friction. But gain for `(THETA=pi//2)`, friction would be zero.

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