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A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with an angular velocity `omega.` another disc of the same dimensions but of mass M/4 is placed gently on the first disc coaxially. The angular velocity of the system now is

A

`2omega//5`

B

`2omega//sqrt5`

C

`4omega//5`

D

`4omega//sqrt5`

Text Solution

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The correct Answer is:
C
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