$A$ simple pendulum of length $L$ swings in a vertical plane. The tension in the string when it makes an angle $\theta$ with the vertical and the bob of mass $m$ moves with a speed $v$ is (where $g$ is the gravitational acceleration):
- A$m v^{2} / L$
- B$m g \cos \theta + m v^{2} / L$
- C$m g \cos \theta - m v^{2} / L$
- D$m g \cos \theta$
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