2) A spring having elastic constant k is attached to one end of an air cart of mass M. The other end of the air cart is tied to a mass m by a string that hangs over a light pulley of negligible friction. The air cart is then released from rest when the spring is at its relaxed length. a) Use conservation of energy to predict the maximum distance the air cart will stretch the spring. b] If m's mass is increased by Am, predict how far the cart will move before it reaches the maximum distance em its starting point? to mmputer to computer