3. What is the slope of the line that passes through the points E(5, 1) and F(2, -7)? A. 8/3
B. 3/8
C. -3/8
D. -8/3

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).