mass energy relation

[lakshmi]

somebody explain me einstein mass energy relation

[Nenad]

E = mc^2, there E is energy, m is mass, and c is the speed of light (3.0x10^8m/s)

[JohnDubYa]

Mass is a form of energy. The amount of mass-energy "stored" in an object is given by E = mc^2. So when the mass-energy is transformed into motion (kinetic) energy, the resulting system will have mc^2 amount of kinetic energy.

[Hyperreality]

Note that the enery-mass relation is only true if the object is stationary or travelling at a relative low speed compare to light. In general, the kinetic energy for an object is

E=mc^2(1/(1-v^2/c^2)-1), so when v=0, E=mc^2.