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A mass weighing 10 pounds stretches a spring 3 inches. This mass is removed and replaced with a mass weighing 51.2 pounds, which is

A mass weighing 10 pounds stretches a spring 3 inches. This mass is removed and replaced with a mass weighing 51.2 pounds, which is initially released from a point 4 inches above the equilibrium position with a downward velocity of 5/4 ft/s. Determine the equation of motion.

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