Which equation represents a line parallel to the line shown on the graph? a. y=3x-7 b. y=-3x+3 c. y=1/3x+7/9 d. y=-1/3x+12

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).