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Time Period of Pendulum

The bob of a ...

Question

The bob of a simple pendulum of length $l$ is released when the string is horizontal. Find its speed at the bottom.

A

\sqrt{2 g l}

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B

\sqrt{5 g l}

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C

\sqrt{g l}

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D

\sqrt{6 g l}

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Solution

The correct option is A $\sqrt{2 g l}$
Let the mass of pendulum bob be $m$ kg
From energy conservation,
$m g l = 1 / 2 m u^{2}$

$u = \sqrt{2 g l}$

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