Spring and Work

An object of mass \(0.5 \text{ kg} \) is engaged to a spring at the ceiling. When the equilibrium is reached the spring is \(0.2 \text{ m} \) stretched: what is (in J) the work done by the spring if it were \(0.4 \text{ m} \)stretched?

Take g = 9.8 meters per second squared.

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