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A body is moving in a verticle of radius...

A body is moving in a verticle of radius `r` such that the string is just taut at its highest point.
(i) The speed of the body at the highest point is `sqrt(gr)`
(ii) The speed of the body at the lowest point is `sqrt(5gr)`
(iii) The speed of the body when the string is horizontal is `sqrt(3gr)`
(iv) The tension in the string is maximum when the body is in the lowest position.

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