Anyone wanna do me a favor..? Go to You-Tube and search ALYZABETH MILLER all caps. Like the videos and subscribe :) If you do ill make a question for you and give you 50 points! ;)

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 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 if the mass is driven by an external force equal to f(t)=cos(2t).