On a frictionless, horizontal air table, puck A (with mass0.250 kg) is moving toward puck B (with mass 0.330 kg),which is initially at rest. After the collision, puck Ahas a velocity of 0.120 m/s to the left, and puck B has avelocity of 0.830 m/s to the right.
a) What was the speed of puck Abefore the collision?
b) Calculate the change in the total kinetic energy of the systemthat occurs during the collision.