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A spring and its force constant

A spring whose force constant k= 84 nt/m is suspended by one end from a support. The unstressed spring's length is .66 m. Find the length of the spring when a mass of M= 12 kg is suspended from the lower end, in equilibrium.

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Step 1.
Recall that the relationship between the force F exerted on a spring and the elongation x which is ...