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A force of 12 N is required to stretch a spring 4 m. A
mass of 1 kg is attached to the spring and the spring is
submerged in a medium creating a damping force numer-
ically equal to four times the velocity. The spring is strec-
thed 1 m past equilibrium and released from rest. Find
the equation of motion of the spring as a function of time.

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