A ring rolls without slipping on the gro...

A ring rolls without slipping on the ground. Its centre `C` moves with a constant speed `u.P` is any point on the ring. The speed of `P` with respect to the ground is `v`.

`0levle2u`

v=u, if CP is horizontal.

v=u, if CP makes an angle of `60^(@)` with the horizontal and P is below the horiozontal level of C.

`v=sqrt(2)u`, if CP is horizontal

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a, c, d

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