A mass is tied to a string and rotated in a vertical circle, the minimum velocity of the body at...

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A mass is tied to a string and rotated in a vertical circle, the minimum velocity of the body at the top is
(a) \( \sqrt{\mathrm{gr}} \)
(b) \( g / r \)
(c) \( \left(\frac{\mathrm{g}}{\mathrm{r}}\right)^{3 / 2} \)
(d) \( \mathrm{gr} \)
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