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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A thin uniform circular disc of mass and radius is rotating in a horizontal plane about an axis passing through its centre and perpendicular to the plane, with an angular velocity . Another disc of the same dimensions but of mass is placed gently on the first disc coaxially. The angular velocity of the system now is

Answer: (B)

Solution

$Missing argument for \dfrac\dfracω = [Missing argument for \dfrac\dfrac+Missing argument for \dfrac\dfrac12(ω'

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Question ID VK-158535