Question

e=mc2 formula define please.

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

hey mate here is ur ans

here
e. ..... meant for the energy is directly proportional to mass m
I.e,

e proportional to m (mass)
then remove the proportional , and introduce the constant c , where c is the speed of light

hence it is given by
e=mc^2

hope it may help u