On a frictionless, horizontal air table, puck A (with mass 0.250 kg ) is moving toward puck B (with mass 0.360 kg ), that is initially at rest. After the collision, puck A has a velocity of 0.125 m/s to the left, and puck B has velocity 0.655 m/s to the right.
I already solved for the puck's initial velocity, which is 0.818m/s. Now I have to find the change in the total kinetic energy of the system that occurs during the collision.
The Attempt at a Solution
I tried this both negative and positive, but both are wrong. I don't know what I did wrong.