A rod of length $l$ is hinged from one end. It is brought to a horizontal position and released. The angular velocity of the rod when it is in the vertical position is

  • A

    $\sqrt {\frac {g}{l}}$

  • B

    $\sqrt {\frac {2g}{l}}$

  • C

    $\sqrt {\frac {3g}{l}}$

  • D

    $\sqrt {\frac {g}{2l}}$

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