Question

Why e=mc2 which was proved by Albert
Einstein

Answer 1

It tells us that mass and energy are related, and, in those rare instances where mass is converted totally into energy, how much energy that will be. The elegance with which it ties together three disparate parts of nature—energy, the speed of light and mass—is profound.

Answer 2

$\huge\bf{hey}$

$\huge { \mathfrak{here \: is \: answer}}$

pls see in pic

in this famous equation

e is energy 

m is mass

and c ^2 is speed of light

using this equation 

Einstein showed the relationship between the mass and energy.

and according to the theory of relativity

nothing can travel higher than the speed of light.

which values 299729458m/s

hence

Einstein used this to show the relationship between the energy of the object with mass and velocity

and

showed that energy is equal to product of mass and speed of light^2

$\huge \boxed{ \boxed{hope \: it \: helps}}$

$\huge{ \mathbb{THANKS}}$