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In the figure shown a plank of mass m is lying at rest on a...

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Physics

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In the figure shown a plank of mass m is lying at rest on a smooth horizontal surface A dise of same mass m and radius ris rotated to an angular speed and then gently placed on the plank If we consider the plank and the disc as a system then frictional force between them is an internal force Momentum of the system changes due to external force only It is found that finally slipping cease and 50 of total kinetic energy of the system is lost Assume that plank is long enough is coefficient of friction between disc and plank 24 Final velocity of the plank is r000 A B Fog m r 000 m O rog D None of these

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