what does e=mc2 mean?

Answer 1

e=mc2 is the Eienstein's famous equation of relativity. This equation only applies to very tiny particles, who can move with the speed of light. 'c' here is the speed of light which is a constant quantity. 'm' is the mass of the tiny parrticle.
When a tiny particle moves with a velocity which is the square of velocity of light, it produces energy.

So, you might wonder why the solar energy is so poweful that we can even run a car.

Answer 2

During a nuclear fission process where the nucleus of an atom is split, the total mass of the resulting parts is a little less than the mass of the original nucleus that was split up. Where did all this matter go? It was converted into energy. At what rate was it converted? Energy [E] yielded from the matter [m] at the conversion proportion of the speed of light {in a vacuum}squared [c^2]. This is also true for fusion reactions. The mass of the original two nuclei that are fused is greater than the resulting mass of the end result. Where did the matter go? Again it was converted into energy.
This famous equation came from Einstein's manipulations of James Clerk Maxwell's equations about electromagnetism while working on his Special Theory of Relativity.

Answer 3

It is an universal equation for the energy released or absorbed by any body depending only on its mass.
Mathematically,e is directly proportional to mass.or e=km or e=mc2.c2 is the constatnt of proportionality.

Answer 4

It means energy = mass X constant squared, the constant being the speed of light.

Answer 5

E means energy,
m=mass
c=constant
2=squared.
So energy is the same as mass multiplied by the constant, squared!

Answer 6

The speed of light!

Answer 7

it's the speed of light in a vacuum