Blair fires a paintball from his gun. the paintball travels the 30-cm length of the barrel in 0.066 sec. what is the average speed of the paintball

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)