1. The problem statement, all variables and given/known data I really don't have a homework question just a thought. Is rest energy "maximum energy" for a particle? As to say a particle at rest has a given energy, so when it is in motion it transfers some mass energy to kinetic energy, where both the mass and kinetic energy together equal the rest energy? 2. Relevant equations E=mc^2 E= T+ mc^2 3. The attempt at a solution I know that E=mc^2 is supposed to include both the mass energy and kinetic energy. But what about the second equation. To me, that suggests that the rest energy is actually the total energy, as to say it is equal to the kinetic energy plus the rest energy. Can you guys help me straighten this out in head?