Einstein's Mass-Velocity Equation

Physical Law
The mass $$m$$ of a body is not constant.

It varies with the body's velocity, according to the equation:
 * $$m = \frac {m_0}{\sqrt{1 - \dfrac {v^2}{c^2}}}$$

where:
 * $$v$$ is the magnitude of the velocity of the body;
 * $$c$$ is the velocity of light;
 * $$m_0$$ is the rest mass of the body.