A vertical spring with force constant $k$ is fixed on a table. A ball of mass $m$ at a height $h$ above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance $d$. The net work done in the process is
A vertical spring with force constant $k$ is fixed on a table. A ball of mass $m$ at a height $h$ above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance $d$. The net work done in the process is
- A
$mg\left( {h + d} \right) - \frac{1}{2}\,k{d^2}$
- B
$mg\left( {h - d} \right) - \frac{1}{2}\,k{d^2}$
- C
$mg\left( {h - d} \right) + \frac{1}{2}\,k{d^2}$
- D
$mg\left( {h + d} \right) + \frac{1}{2}\,k{d^2}$
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