Robert J. Kolker

Energy is denominated in units as M and V^2 where M is mass and V is velocity. Classical kinetic energy is m*v^2/2 and mass to energy conversion relativistically is rest mass times the square of the speed of light. Why is this the case? My guess is that energy is propagated with spherical symmetry in empty space. Many of the physical laws are the consequence of underlying symmetries.

Bob Kolker