Problem: A beam of light in air is incident on the surface of a rectangular block of clear plastic on a frictionless, horizontal air table, puck A (with mass 0.250kg ) is moving toward puck B (with mass 0.400kg ), which is initially at rest. After the collision, puck A has a velocity of 0.150m/s to the left, and puck B has a velocity of 0.630m/s to the right
Part I: What was the speed of puck A before the collision?
Part II: Calculate the change in the total kinetic energy of the system that occurs during the collision.
Rework your solution from the beginning and check each step carefully.