You will be able to calculate rest energy and mass. You will understand that mass and energy are different aspects of the same underlying quantity, and that is the total of mass and energy that is t...You will be able to calculate rest energy and mass. You will understand that mass and energy are different aspects of the same underlying quantity, and that is the total of mass and energy that is truly conserved. You will know that a tiny amount of matter can release a great deal of energy. You will understand that it is possible to produce a pair of charged particles from an energetic photon, and that the annihilation of a particle-antiparticle pair releases energy.