In: Math
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) = 10
cos(3t).
(Use g = 32 ft/s2
for the acceleration due to gravity.)