Hello. I am an intro Physics student and this is my first post here. In Coulomb's law the charges are said to be stationary. I need some clarification about what does it mean for two charges to be stationary: A. Does it mean that the charges are not moving with respect to each other? (But maybe can move together with a constant velocity?) B. Does it mean that the charges and the observer applying Coulomb's law has no movement compared to each other? C. What if the charges and the observer all are accelerating at the same rate? I am sorry if the answer is obvious. I would really appreciate your help.