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
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
- 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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