A mass weighing 32 pounds stretches a spring 16 feet. The mass is initially released from rest...

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Amass weighing 32 pounds stretches a spring 16 feet. The mass isinitially released from rest from a point 2 feet below theequilibrium position, and the subsequent motion takes place in amedium that offers a damping force that is numerically equal to 1/2the instantaneous velocity. Find the equation of motion if the massis driven by an external force equal to f(t)=10cos(3t).

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