I asked a class of students what the difference was of velocity versus speed. The answer I was looking for was "direction" i.e. one is a vector. But a number of them said "Velocity is displacement divided by time, and speed is distance divided by time." Ignoring the second half of that assertion, I'm not sure what to say about the statement…because that is exactly what the equation says! (V=deltaX/t). To complicate things, "velocity" is ofttimes used colloquially and not in such a picky way. What would you say to the students who responded like this?