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3. A mass weighing 16 pounds stretches a spring 4 inches. It is released from a position 12 inches below its
equilibrium position with a upward velocity of 6 ft/s.
a) Find the equation of motion in the form x(t)=c, cos cot+c₂ sin cot
b) Find the equation of motion in the form x(t)= Asin(at +). You may express as a 4 decimal place
radian value.

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