Equivalence Principle - the force of gravity in its physical action does not differ from the inertia force equal to it in magnitude.
First Postulate of Special Theory of Relativity (principle of the absence of an absolute reference system) - if the body does not experience acceleration, it is impossible to determine whether it is at rest or moving uniformly and rectilinearly.
Second Postulate of Special Theory of Relativity (principle of absolute speed of light) - the speed of light is always constant with respect to any bodies.
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