A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring , feet. The ball is started in motion from the equilibrium position with a downward velocity of 3 feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second). Suppose that after t seconds the ball is y foot below its rest position. Find y in terms of t. (Note that the positive direction is down.) Take as the gravitational acceleration 32 foot per second per second