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A coin of mass m is placed on a horizontal platform which is undergoing S.H.M. about a mean position O in horizontal plane. The force of friction on the coin is f. While the coin does not slip on the platform f is

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directed away from O always

maximum when coin and platform are at rest

directed towards O when the coin moves in wards

directed towards O always.

answer is A, C, D.

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Detailed Solution

When a body undergoes SHM , its acceleration is always directed towards its equilibrium position. S the frictional force is always directed towards O.

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