# 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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