Answer :


The normal reaction will be balancing the centrifugal force. Hence,



So, the normal reaction will be,


(b)


Friction force is at maximum as the body is moving,



Putting the value of N we get,



This will be the force of friction.


(c)


The only force changing the velocity will be friction. The friction is,




As the tangential acceleration will actually decrease the speed, so,



(d)



So, we can write,







For one complete revolution, s=2∏R. so,




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