To find the average velocity of the car over the given period of time, we need to consider the displacement and the time taken.
The car travels ten meters during deceleration and then accelerates back up again, covering the same distance. Assuming the deceleration and acceleration are symmetrical and the car returns to its original position, the net displacement of the car over this period is zero meters.
Since the displacement is zero, the average velocity is also zero. This means that, on average, the car does not change its position over the given period of time.