Question

prove e=mc^2.............

Answer 1

I can't derive but whole general relativity is based on 2 postulates those are

Postulate I: The principle of relativity:  The laws of physics are the same in all inertial frames.

Postulate II: The principle of the constancy of the speed of light:The speed of light (in a vacuum) has the same constant value c in all inertial frames.

HOPE THIS WAS A BIT HELPFUL!!

Answer 2

$\huge \bf{ \red{hey}}$

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

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

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

$\huge{ \pink{thanks}}$