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A stone is fastened to one end of a stri...

A stone is fastened to one end of a string and is whirled in a verticla circle of radius R. Find the minimum speed the stone can have at the highest point of the circle.

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At highest point of vertical circle,
`(mv^2)/R=mg`
`rarr v^2=Rg`
`rarr v=sqrt(Rg)`
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