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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. B. C. D. |
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Answer» Correct Answer - B::C 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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