A stone of mass \( m \) is tied to a string and is moved in a vertical circle of radius \( r \) ...

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A stone of mass \( m \) is tied to a string and is moved in a vertical circle of radius \( r \) making \( \mathrm{n} \) rev/min. The total tension in the string when the stone is at the lowest point is
(a) \( \mathrm{mg} \)
(b) \( \mathrm{m}\left(\mathrm{g}+\pi \mathrm{nr}^{2}\right) \)
(c) \( \mathrm{m}(\mathrm{g}+\mathrm{nr}) \)
(d) \( \mathrm{m}\left(\mathrm{g}+\frac{\pi^{2} \mathrm{n}^{2} \mathrm{r}}{900}\right) \)
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