There are two ways by which absolute motion might be detected: by measuring motion with respect to a beam of light, and by making use of inertial effects that arise when an object is accelerated. So why MichelsonMorley experiment showed the first method to be unworkable? Einstein's special theory of relativity explained why. Correct me if I am wrong. Special relativity proved that no matter the position or speed with which a person is moving, the speed of light will be the same. Is this correct? otherwise how does SR prove that the first method is unworkable?