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A small body is tied to an end of an ine...

A small body is tied to an end of an inextensible string of negligible mass and length r, the other end being clamped to a rigid support. What is the minimum velocity with which the body must be projected horizontally so that it can go completely round a vertical circle without slakening of the string at the highest point ?

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The correct Answer is:
`sqrt(5gr)`
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