I understand that it's possible to have a negative instantaneous velocity, but I'm wondering if it's possible to have an negative average velocity. For example, let's say you start heading north at a constant 10 mph for an hour. The second hour, you drive south (directly toward the starting point) at 10 mph (i.e -10 mph north). For the entire 2nd hour, your instantaneous velocity is -10 mph north, but after the trip, the average comes to 0 mph since you've stopped right where you started. So does this mean that a negative average velocity is impossible to achieve?