A thin uniform circular disc of mass and radius is rotating in a horizontal plane about an axis passing through its centre and perpendicular to the plane with an angular velocity . Another disc of same dimensions but of mass is placed gently on the first disc co-axially. The angular velocity of the system is |
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a) |
b) |
c) |
d) |

A thin uniform circular disc of mass and radius is rotating in a horizontal plane about an axis passing through its centre and perpendicular to the plane with an angular velocity . Another disc of same dimensions but of mass is placed gently on the first disc co-axially. The angular velocity of the system is |
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a) |
b) |
c) |
d) |

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