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A 7 kg cart, A, and a 3 kg cart, B, are initially held together at rest on a horizontal, frictionless surface. When a compressed spring attached to one of the carts is released, the carts are pushed apart. After the spring is released, the speed of cart B is 6 m/s, as represented in the diagram below. How much potential energy PE was stored in the spring? A block of mass m = 4.4 kg moving on a frictionless surface with a speed of 9.2 m/s makes a sudden perfectly elastic collision with a second block of mass M, as shown in the figure below. The second block is originally at rest. Just after the collision, the 4.4 kg block recoils with a speed of 2.5 m/s. What is the mass M of the second block?