An ideal spring is hung vertically in its equilibrium position from a ceiling. When a 3.0 kg mass hangs at rest from it, the

Question

An ideal spring is hung vertically in its equilibrium position from a ceiling. When a 3.0 kg mass hangs at rest from it, the spring is extended 8.0 cm from its equilibrium length. A downward external force is now applied to the mass to extend the spring an additional 12.0 cm. While the spring is being extended by the external force, what is the elastic potential energy gained by the spring?

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