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A vertical spring with force constant K ...

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 dsitance d. The net work done in the process is:

A

`mg (h - d) + 1/2Kd^2`

B

`mg (h + d) + 1/2Kd^2`

C

`mg (h + d) - 1/2Kd^2`

D

`mg (h - d) - 1/2Kd^2`

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