Question

A disc of radius r and mass m is rotating about an axis passing through its centre and perpendicular to its plane with angular speed . It is gently kept vertically on a frictionless surface. What will be the velocity of its centre.

Answer 1

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Answer 2

REMAIN CONSTANT

Angular momentum of the body about COM

L=mR2w+IWL=mR2w+IW

=mR2w+mR22w=mR2w+mR22w

=32=32

m,y,v are zero so Angular momentum will be zero