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so now i want to find the change in Kinetic Energy, so i am doing

.5(mA + mB)( velocity final ^2) - .5(mA + mB)( velocity initial^2)

but what i am confused about is what i am suppose to use for the final velocity and initial velocity. i mean do i just add if initial velocities of obj A and B and use that as Vi, and add up the final velocities of obj A and B and use that as Vf? i dont think that seems right? any help would be great!