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Q.

A ring and a disc of same mass roll without slipping along a horizontal surface with same velocity. If the K.E of ring is 8J, then that of disc is ______ (in J)

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answer is 6.

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Detailed Solution

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E=12mV2(1+β)

Since the mass and radius are same 

E∝1+β

E2E1=1+β21+β1

E28=1+121+1=32×12

⇒E2=34×8=6J

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