1A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring feet. The ball is started in motion from the equilibriumposition with a downward velocity of 4 feet per second. The air resistance (in pounds) of the moving ball numerically equals 4 times its velocity (in feet per second).Let u(t) be the displacement of the mass from equilibrium. Suppose that after t seconds the ball is u feet below its rest position. Find u (in feet) in terms of t. (Notethat the positive direction is down.)Take as the gravitational acceleration 32 feet per second per second.u = 4te^(-24t)How would you characterize the damping in this mass-spring system?underdamped

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