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A thin uniform circular disc of mass M a...

A thin uniform circular disc of mass M and radius R is rotating in a horizonatl plane about an axis passing through its centre and perpendicular to its plane with an angular velocity `omega`. Another disc of same thickness and radius but of mass `(1)/(8)` M is placed gently on the first disc coaxially. The anuglar velocity of the system is now

A

`(8)/(9)omega`

B

`(5)/(9)omega`

C

`(1)/(3)omega`

D

`(2)/(9)omega`

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The correct Answer is:
A
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