If you apply a 55 n force a spring extends by 25 cm, Ask an Expert

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If you apply a 55 N force, a spring extends by 25 cm. Determine how much energy was needed to stretch the spring supposing you started from its unstretched length? Determine how much energy (in Joules) should you use to stretch it the other 15 cm (from 25 cm to 40 cm)? Please illustrate your work.

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