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A uniform disc of mass M and radius R is...

A uniform disc of mass M and radius R is rotating in a horizontal plane about an axis 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 coaxial. Then final angular velocity of the system is

A

`frac(omega)(5)`

B

`frac(2omega)(5)`

C

`frac(3omega)(2)`

D

`frac(2 omega)(3)`

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