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A solid spherical ball of radius 30 cm a...

A solid spherical ball of radius 30 cm and mass M is connected to a point A on wall with a thread and freely rotate about its central axis with angular velocity 60 rad`//`sec. If the ball is resting onthe vertical face of a wall, what time will elapse before it comes to rest ? The coefficient of friction between wall and ball is 0.25 and inclination of thread to vertical is `15^(@)`.

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