E = mc^2 - Vidyadip

Question

$E = mc^2$

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Answer

Before Sir Einstien, mass and energy were two completely different physical quantities, which were not related to each other anyway.
Sir Einstein told that energy and mass are related to each other i.e. energy and mass can be converted into each other by the following relation:
$E=mc^2,$ called Sir Einstein's mass$-$energy equivalence.

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