Two particles of mass $m$ each are fixed at the opposite ends of a massless rod of length $5m$ which is oriented vertically on a smooth horizontal surface and released. Find the displacement of the lower mass on the ground when the rod makes an angle of $37^o$ with the vertical. ........ $m$

  • A

    $1.5$

  • B

    $2$

  • C

    $2.5$

  • D

    $3.5$

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