A ball is released from rest relative to the elevator at a distance h1 above the floor. The speed of the elevator at the time of ball release is v0. Determine the bounce height h2 relative to elevator of the ball (a) if v0 is constant and (b) if an upward elevator accleration a=g4 begins at the instant the ball is released. The coefficient of restitution for the impact is e = 2/3.