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Special relativity is based on two postulates which are contradictory in classical mechanics: The resultant theory copes with experiment better than classical mechanics.

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The upshot of this is that free fall is inertial motion: an object in free fall is falling because that is how objects move when there is no force being exerted on them, instead of this being due to the force of gravity as is the case in classical mechanics.Maxwell's equations—the foundation of classical electromagnetism—describe light as a wave that moves with a characteristic velocity.The modern view is that light needs no medium of transmission, but Maxwell and his contemporaries were convinced that light waves were propagated in a medium, analogous to sound propagating in air, and ripples propagating on the surface of a pond.Einstein developed general relativity between 19, with contributions by many others after 1915.The final form of general relativity was published in 1916.) used in 1906 by Planck, who emphasized how the theory uses the principle of relativity.This is incompatible with classical mechanics and special relativity because in those theories inertially moving objects cannot accelerate with respect to each other, but objects in free fall do so.