Question

A mass weighing 16 pounds stretches a spring 8 3 feet. The mass is initially released...

A mass weighing 16 pounds stretches a spring
8
3
feet. The mass is initially released from rest from a point 3 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to
1
2
the instantaneous velocity. Find the equation of motion
x(t)
if the mass is driven by an external force equal to
f(t) = 20 cos(3t).
(Use
g = 32 ft/s2
for the acceleration due to gravity.)

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