The bob of a pendulum of length $l$ is pulled aside from its equilibrium position through an angle $\theta $ and then released. The bob will then pass through its equilibrium position with speed $v$ , where $v$ equals
The bob of a pendulum of length $l$ is pulled aside from its equilibrium position through an angle $\theta $ and then released. The bob will then pass through its equilibrium position with speed $v$ , where $v$ equals
- A
$\sqrt {2gl\,\sin \,\theta } $
- B
$\sqrt {2gl\,\left( {1 - \sin \,\theta } \right)} $
- C
$\sqrt {2gl\,\left( {1 - \cos \,\theta } \right)} $
- D
$\sqrt {2gl\,\left( {1 + \sin \,\theta } \right)} $
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