# Special relativity (mass-energy) Calculator

## Calculates the mass-energy of a body moving with some relative velocity with respect to the observer.

Rest mass m0
 kg
Relative velocity v
 km/s ≦c

Rest mass energy E0
 MJ
Relativistic mass energy E
 MJ
Mass energy rate E/E0
Velocity ratio to light v/c
 %
 $\normal Mass\ energy\\\vspace{5}\\\hspace{20}E_0=m_0 c^2\\\hspace{20}E={\large\frac{E_0}{\sqrt{1-{\large\frac{v^2}{c^2}}}}}={\large\frac{m_0c^2}{\sqrt{1-{\large\frac{v^2}{c^2}}}}}\\\hspace{20}c=299792.458km/s\\$

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