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A disc rotates freely with rotational ki...

A disc rotates freely with rotational kinetic energy E about a normal axis through centre. A ring having the same radius but double the mass of disc of now. Gently placed on the disc. The final rotational kinetic energy of the system would be

A

`E//2`

B

`2E//5`

C

`E//5`

D

`E//3`

Text Solution

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The correct Answer is:
C
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