In the figure shown, a particle is released from the position $A$ on a smooth track. When the particle reaches at $B$, then normal reaction on it by the track is .........

212898-q

  • A

    $2 m g$

  • B

    $m g$

  • C

    $\frac{2}{3} m g$

  • D

    $\frac{m^2 g}{h}$

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