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 kd²
(b) mg(h-d)-1/2 kd²
(c) mg(h-d)+1/2 kd²
(d) mg(h+d)+1/2 kd²

Correct Answer:

mg(h+d)-1/2 kd²

Explanation:

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