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

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

5 `rad//s`

7 `rad//s`

10`rad//s`

4.9`rad//s`

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