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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A disc of mass 2 kg and radius 0.2 m is rotating with angular velocity 30 rad/s. What is the angular velocity if a mass of 0.25 kg is put gently on the periphery of the disc?

Answer: (A)

Solution

Conservation of angular momentum: .

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Question ID VK-158512