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A small coin is kept at the rim of a hor...

A small coin is kept at the rim of a horizontal circular disc which is set into rotation about vertical axis passing through its centre. If radius of the disc is 5cm and `mu_s=0.25`, then the angular speed at which the coin will just slip is

A

5 rad/s

B

7 rad/s

C

10 rad/s

D

4.9 rad/s

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