Hi I'm in an honors physics class. I don't really understand the difference between average speed and instantaneous speed. Say I'm given in data table with time (s) and distance (m). How can I find each of these? Is there a formula? Also, what is the relationship of velocity with acceleration? My teacher said constant velocity means no acceleration? I'm not sure that makes sense?! One more thing: What is the difference between displacement vectors and resultant vectors? I seem to be stuck. I know for one you just add the magnitudes but for the other it's pythagorean. Any help would be great!