A pendulum is suspended in a lift and its period of oscillation when the lift is stationary is  $T_0$. What must be the acceleration of the lift for the period of oscillation of the  pendulum to be $T_0/2$ ?

  • A

    $2g$ downward

  • B

    $2g$ upward

  • C

    $3g$ downward

  • D

    $3g$ upward

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