25. How does the mass of matter vary with its velocity?

            Matter is accelerated by photons. Upon impact a photon is partially scattered and partially absorbed by the electromagnetic field of the particle. Its mass then increases with velocity as given by the equation

where  is the matter particle mass when moving,  is the matter particle mass when at rest, “v” is the particle velocity, and “c” is the speed of light.

            Since the particle causing the acceleration (i.e., the photon) moves at the speed of light matter can go no faster than the speed of light.