1. The problem statement, all variables and given/known data A 2kg object moving 5m/s in the positive x direction has a one dimensional elastic collision with a 4kg object moving at 1m/s in the same direction. What is the resulting change in kinetic energy of the 4 kg object? 2. Relevant equations K=1/2 m*v^2 m1v1+m2v2=(m1+m2)V 3. The attempt at a solution after solving for V would i just plug that into the kinetic energy and subtract it from the original kinetic energy of the 4kg object?