On a frictionless horizontal air table, puck A (with mass 0.255 kilogram) is moving toward puck B (with mass 0.375 kilogram), which is initially at rest. After the collision, puck A has velocity 0.119 m/s to the left, and puck B has velocity 0.655 m/s to the right.
Find what was the speed of puck A before the collision?
Compute the change in the total kinetic energy of the system that occurs during the collision?