A wheel rolls purely on ground. Find a point on the periphery of a body which has a velocity equal to the velocity of the centre of mass of the body.
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Velocity of any point on the circumference of a rolling body `v_(p)=2v_(CM)costheta/2` For `v_(p)=v_(CM),` we have `v_(CM)=2v_(CM)costheta/2=1/2` or `theta=120^@`
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