Initially system is in equilibrium. Time period of $SHM$ of block in vertical direction is

817-460

  • A

    $2\pi \sqrt {\frac{m}{{3k}}} $

  • B

    $2\pi \sqrt {\frac{m}{{2k}}} $

  • C

    $2\pi \sqrt {\frac{m}{k}} $

  • D

    $2\pi \sqrt {\frac{{2m}}{k}} $

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