$007,10\mathrm{.}0$ points

A rock of weight $W$ is tied to a massless rod and whirled at constant speed $v$ in a vertical circle of radius $R.$ The tension in the rod at the top is $T_T$ and the tension at the bottom is $T_B.$

Then

$T_T=W+\frac{M{v}^2}{R}$ and $T_B=W+\frac{M{v}^2}{R}$

$T_T=W-\frac{M{v}^2}{R}$ and $T_B=W+\frac{M{v}^2}{R}$

$T_T=+W$ and $T_B=-W$

A$.T_T=\frac{M{v}^2}{R}$ and $T_B=\frac{M{v}^2}{R}$

$T_T=\frac{M{v}^2}{R}-W$ and $T_B=\frac{M{v}^2}{R}+W$