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Calculate DeltaK, the change in the total kinetic energy of the system that occurs during the collision.

- I got ΔK = .007 but was not right

-puck A with speed 0.834 is 0.5*0.253*(0.834)2 . Total energy of the two pucks afterwards are 0.5*0.253*(0.124)2 +0.5*0.373*(0.650)2