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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A man of 80 kg mass is standing on the rim of a circular platform of mass 100 kg, rotating about its own axis at 12.0 rpm. If the man moves to the centre of the platform, the rotational speed would become

Answer: (D)

Solution

Treating the platform as a disc () and the man as a point mass at the rim () moving to the centre (contributing there), with kg,

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Question ID VK-158736