For a given system, how can you tell which one is kinetic energy for center of mass and which one is internal kientic energy?
K = Kcm + K int
For example, "A 150 g trick baseball is thrown at 63 km/h. It explodes in flight into two pieces, with a 39 g piece continuing straight ahead at 85 km/h. How much energy do the pieces gain in the explosion?"
I found the answer using conservation of momentum. I solved for the velocty and then taking the difference in kinetic energies before and after, the change was .984 J. However, relative to the equation, how do I know which one is internal kinetic energy and which is center of mass kinetic energy. Does K in the equation mean to total energy? How would you find Kcm and Kint? Can someone please clarify?