What is the relationship between mass and velocity with energy? Mass is equivalent and convertible to sunlight with respect to light. We imagined that the movement of the universe is derived from a state of stillness that appears for short periods of time and in a sequential manner.In the weak-field approximation of covariant theory of gravitation the problem of 4/3 is formulated for internal and external gravitational fields of a body in the form of a ball. The dependence of the energy and the mass of the moving substance on the energy of field accompanying the substance, as well as the dependence on the characteristic size of the volume occupied by the substance are described. Additives in the energy and the momentum of the body, defined by energy and momentum of the gravitational and electromagnetic fields associated with the body are explicitly calculated. The conclusion is made that the energy and the mass of the body can be described by the energy of ordinary and strong gravitation, and through the energies of electromagnetic fields of particles that compose the body.

energy; momentum; theory of relativity; gravitation; field potentials.