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A ring and a disc of different masses are rotating with the same kinetic energy. If we apply a retarding torque T on the ring it stops after making n revolutions, then in how many revolutions will the disc stop under the same retarding torque?

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detailed solution

Correct option is A

Work done in stopping = Change in KE = Final KE - Initial KE, i.e. τθ= K = constant. As τ is same in the two cases,θ must be same, i. e. number of revolution must be same..

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