Well, remember what's going on. The first five seconds, it's moving to the right, it's decelerating the whole time, and then right at five seconds, it has gone 12.5 meters to the right. But then it starts, its velocity starts becoming negative, and the particle starts moving to the left. And so over the next five seconds, it actually moves 12.5 meters to the left, and then these two things net out. And so the particle has gone over 10 seconds, 12.5 meters to the right, and then 12.5 meters to the left, and so its change in position is zero meters. It has not changed. Now you might start to be appreciating what the difference between displacement and distance traveled is.