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Q.

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

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a

Directed towards O always.

b

Directed towards O When the coin moves in way

c

Directed towards O When the coin moves out.

d

Maximum when mass and platform are at rest.

answer is A, C, D.

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