A ball of mass $m$  is dropped from a heigh $h$  on a platform fixed at the top of a vertical spring, as shown in figure. The platform is depressed by a distance $x.$  Then the spring constant is

829-397

  • A

    $\frac{{mg}}{{(h + x)}}$

  • B

    $\frac{{mg}}{{(h + 2x)}}$

  • C

    $\frac{{2mg(h + x)}}{{{x^2}}}$

  • D

    $\frac{{mg}}{{(2h + x)}}$

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