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A man revolves a stone of mass \( m \) tied to the end of a string in a vertical circle of radius \( R \). The net forces at the lowest and highest points of the circle directed vertical downwards are
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are towest point
Highest point
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(1) \( m g-T_{1} \)
(2) \( m g+T_{1} \)
\[
\begin{array}{l}
m g+T_{2} \\
m g-T_{2}
\end{array}
\]
(3) \( m g+T_{1}-\frac{m v^{2}}{r} \) \( m g-T_{2}+\frac{m v^{2}}{r} \)
(4) \( m g-T_{1}-\frac{m_{1} v_{1}^{2}}{R} \) \( m g+T+\frac{m_{1} v_{1}^{2}}{R} \)
Here \( T_{1}, T_{2} \) (and \( \nu_{1}, v_{2} \) ) denote the tension in the string (and the speed of the stome) at the lowest and highest points, respectively-
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