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Explain E = mc^2.

E = mc^2 is considered to be the most well-known contribution by the famous German physicist Albert Einstein. This is his famous mass-energy equivalency equation and relates mass and energy.


`E = mc^2`


In this equation, E is the energy of a given body, m is the mass of the body and c is the speed of light (in vacuum, equal to about 3 x 10^8 m/s). 


In simple words, it means that mass and energy are interrelated and every body that has some mass has some internal energy. The amount of energy can be calculated by using the above equation. A massive body will therefore have more energy than a lighter body and similarly, a body in motion will have more energy than a body at rest. Also, the energy contained in a body at rest is a constant. 


Hope this helps. 

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