A mass weighting 24 lbs stretches a spring 4 inches. The mass is in a medium that exerts a damping force of 57 lbs when the mass has a speed of 6 ft/sec. Suppose the object is displaced an additional 8 inches and released. Find an equation for the object's displacement, u(t), in feet after t seconds. u(t) = Use the convention: If the displacement is upward then u < 0

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