Puck A (with mass 0.250 kg) is travelling toward puck B (with mass 0.350 kg), which is originally at rest, on a frictionless, horizontal air table. Puck A has a velocity to the left of 0.120 m/s after the contact, while puck B has a velocity to the right of 0.650 m/s.
(a) How fast was puck A traveling before to the collision?
(b) Determine the change in the system's overall kinetic energy that results from the impact.