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Auniform disc of mass M and radius R is ...

Auniform disc of mass M and radius R is rotating in a horizontal plane about anaxis perpendicular to its plane with an angular velocity `omega`. Another disc of mass M/3 and radius R/2 is placed gently on the first disc coaxially. Then final angular velocity of the system is

A

`12 omega//13`

B

`13 omega//12`

C

`3omega//4`

D

`11 omega//12`

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