On a frictionless, horizontal air table, puck A (with What was the speed of puck A before the collision? mass 0.200 kg ) is moving toward puck B (with mass Express your answer in meters per second. 0.350 kg ), which is initially at rest. After the collision, puck A has a velocity of 0.120 m/s to the left, and puck B has a velocity of 0.620 m/s to the right. Part 3 Calculate the change in the total kinetic energy of the system that occurs during the collision. Express your answer in joules.