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A 11.1 kg object on a horizontal frictionless surface is attached to a spring with k...

A 11.1 kg object on a horizontal frictionless surface is attached to a spring with k = 1300 N/m. The object is displaced from equilibrium 55.0 cm horizontally and given an initial velocity of 12.0 m/s back toward the equilibrium position. What are (a) the motion's frequency, (b) the initial potential energy of the block-spring system, (c) the initial kinetic energy, and (d) the motion's amplitude?

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