Jordan worked out at a gym for 2 hours. his workout consisted of stretching for 21 minutes, jogging for 45 minutes, and lifting weights for the remaining amount of time. what percentage of jordan’s workout was spent lifting weights?

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).