Partly to ensure that the dimensions of the equation balance.
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E=mc2 E=energy m=mass c=speed of light Einstein's equation states that Energy equal mass times the speed of light squared
The energy (E) in any body of matter is equal to its mass (M) times the square of the speed of light (C2)
That equation is the equation that Albert Einstein came up with to describe how to calculate the speed of light. E = energy m = mass c = speed of light
Albert Einstein's most famous equation was probably E=MC2(Energy equals Matter times the (C) speed of light (186,000 miles per second).
This can be answered in two ways... If you're talking about Einstein's equation, then E=MC2. If you are wondering what E means, it stands for energy, so Einstein's equation means, "energy is equal to mass times the speed of light squared'.