Now you might be saying, how can that be? After 10 seconds, how do we, why is our displacement only zero meters? This particle's been moving the entire time. 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.