Einstein's Mass-Energy Equivalence:
The mass and energy are equivalent concepts. The energy produced by complete conversion of mass to energy is equal to the mass of an object times the speed of light squared. This formula applies to the "rest mass" of an object. For fast-moving objects, special relativity applies, and a different formula is required to find the total energy. The unit of energy is Joules (J), where
\[1j = 1 kg. m^{2} / s^{2} \]
\[E = mc^{2} \]
E = energy (Joules, J)
m = mass (kg)
c = speed of light in vacuum (m/s)
