Work, Power and EnergyHard

Question

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 free upper end of the spring falls vertically on the spring so that the spring is compressed by a distsnce d. The net work done in the process is

Options

A.mg(h + d) - kd2
B.mg(h - d) - kd2
C.mg(h - d) + kd2
D.mg(h + d) + kd2

Solution

       
Gravitational potential energy of ball gets convered into elastic potential energy of the spring.
mg(h + d) = kd2
Net work done = mg(h + d) = kd2 = 0

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