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A 4.70 kg object on a horizontal frictionless surface is attached to a spring with spring constant 920 N/m. The object is displaced from equilibrium 50.0 cm horizontally and given an initial velocity of 11.3 m/s back toward the equilibrium position.

(a) What is the frequency of the motion?

(b) What is the initial potential energy of the block-spring system?

(d) What is the amplitude of the motion?

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