I just started to study physics and there is something I don't understand.
average velocity is the displacement (Delta X) divided by time(Delta t), right ?
so, if a car drives from A to B (say in 2 minutes) and back from B to A (in 5 minutes) it's displacement (Delta X) for the entire trip is 0 because it return the same place...
(if we draw a graph of X(t) and we draw a line between the start point and the end point - the slope of that line represents the average velocity, am I right?)
so the average velocity is 0 ??
please enlighten me...