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A mass weighing 10 lb stretches a spring 1/4 foot. This mass is removed and replaced...

A mass weighing 10 lb stretches a spring 1/4 foot. This mass is removed and replaced with a mass of 1.6 slugs, which is initially released from a point 1/3 foot above the equilibrium position with a downward velocity of 3/4 ft/s. Find the first time the mass will be positioned half of the amplitude below the equilibrium.

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