which of the following are the 2 postulates of relativity? (the other choices are consequences of relativity) a. the laws of nature are the same for all observers in uniform motion. b. the length of a moving object is not the same as when it is at rest. c. the speed of light is constant for all observers in uniform motion. d. two events that happen at the same time in one frame, can happen at different times in another frame. e. e