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A mass weighting 8 lbs stretches a spring 2 inches. The mass is in a medium...

A mass weighting 8 lbs stretches a spring 2 inches. The mass is in a medium that exerts a viscous resistance of 3 lbs when the mass has a velocity of 6 ft/sec.

Suppose the object is displaced an additional 7 inches and released.

Find an equation for the object's displacement, u(t), in feet after t seconds.

u(t) =

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