When stretching, the springs performed work equal to 3 J. a) What work did the spring force do in this case?

When stretching, the springs performed work equal to 3 J.
a) What work did the spring force do in this case?
b) How did the spring energy change?

a) the work of the elastic force of the spring A = – 3 J,
b) Spring energy increased by 3 J.

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