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A ring is rolling, without slipping on a...

A ring is rolling, without slipping on a horizontal surface with constant velocity. Speed of point A (at the top) is `v_(A)`. After an interval `T`, the speed of point A again becomes `v_(A)`. During what fraction of the interval T speed of point A was greater than `(sqrt3)/(2) v_(A)`

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The correct Answer is:
`(1)/(3)`
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