A hollow steel ball of mass kg is suspended from a spring. This stretches the spring m. The ball is started in motion from the equilibrium position with a downward velocity of 0.3 meters per second. The air resistance (in N) of the moving ball numerically equals 4 times its velocity (in meters per second). Let u(t) be the displacement of the mass from equilibrium. Suppose that after t seconds the ball is u meters below its rest position. Find u (in meters) in terms of t. (Note that the positive direction is down.) Take as the gravitational acceleration 9.8 meters per second per second. U = How would you characterize the damping in this mass-spring system? overdamped le