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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
1) mg (h+d)-1/kd ²
2) mg (h-d)-1/2kd ²
3) mg (h-d)+1/2kd ²
4) mg (h+d) +1/2kd
1) mg (h+d)-1/kd ²