On a frictionless horizontal air table, puck A (with mass 0.255 kg ) is moving toward puck B (with mass 0.375 kg ), which is initially at rest. After the collision, puck A has velocity 0.119 m/s to the left, and puck B has velocity 0.652 m/s to the right. 1.) What was the speed vAi of puck A before the collision?
2.) Calculate ΔK, the change in the total kinetic energy of the system that occurs during the collision.