Spring and Work

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

Take g = 9.8 meters per second squared.


The answer is -1.96.

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