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A spring is hung vertically with a mass of 0.75 kg attached. It is displaced 4.0 cm from equilibrium when this mass is attached. Find the following: a) The force constant on the spring. (provide a free-body diagram) b) The work done by the spring on the mass as it stretches through the distance. c) If the same mass instead had the work done by the mass on the spring equal to 0.325 J, what displacement would it experience.

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