A simple pendulum is released from $A$ as shown in figure. If $m$ and $l$ represent the mass of the bob and the length of the pendulum respectively, the gain in kinetic energy at $B$ is
A simple pendulum is released from $A$ as shown in figure. If $m$ and $l$ represent the mass of the bob and the length of the pendulum respectively, the gain in kinetic energy at $B$ is
- A
$\frac{{mgl}}{2}$
- B
$\frac{{mgl}}{\sqrt 2}$
- C
$\frac{{\sqrt 3 }}{2}mgl$
- D
$\frac{{2 }}{\sqrt 3}mgl$
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