One end of rod of length $L$ is on horizontal plane. It is inclined at angle $\alpha$ to  horizontal plane. When released its angular velocity after coming to horizontal plane is 

  • A

    $\sqrt{\frac{3g \sin \alpha}{L}}$

  • B

    $\sqrt{\frac{2L}{3g \sin \alpha}}$

  • C

    $\sqrt{\frac{6g \sin \alpha}{L}}$

  • D

    $\sqrt{\frac{L}{g \sin \alpha}}$

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