Question

Hi friends ☺☺☺☺-----------
What is the theory of relativity ?
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Answer 1

Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers. This was the theory of special relativity.

Answer 2

it is e square is same as p times c square plus mcsquared whole squared which basically tells that mass can form energy and vice versa