Question

An exercise spring has a spring constant of 315 N/m. How much work is required to stretch the spring 30 cm? What force is needed to stretch the spring 30 cm?
Use meters for the displacement, X.

Force = k*X = 315*0.3 = 94.5 N
Work = (1/2)*k*X^2 = (1/2)(315)(.3)^2
= 14.2 J
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