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[" A thin uniform disc of mass "M" and r...

[" A thin uniform disc of mass "M" and radius "R" is rotating in a horizontal plane about an axis passing "],[" through its centre and perpendicular to it with angular velocity "omega" .Another disc of same radius but of "],[" mass "M/4" is placed gently on the first disc coaxially.The angular velocity of the system will now finally "],[" change to: "],[[" (A) "(2 omega)/(sqrt(5))," (B) "(2 omega)/(5)," (C) "(3 omega)/(5)," (D) "(4 omega)/(5)]]

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