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

Options

A. `mg(h+d)+(1)/(2)kd^(2)`
B. `mg(h+d)-(1)/(2)kd^(2)`
C. `mg(h-d)-(1)/(2)kd^(2)`
D. `mg(h-d)+(1)/(2)kd^(2)`

Answer

B