A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to the plane with an angular velocity w (omega) another disc of same mass but half the radius is gently placed over it coaxially . the angular speed of the composite disc will be ;
a) 5/4 w b) 4/5w c ) 2/5w d 5/2 w
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i don't know your answear.
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