If my velocity is three meters per second, and since it's positive, you can conceptualize that as it's going to the right at three meters per second, what is my change in position? Well, I would have gone 12 meters to the right. And you don't need calculus to figure that out. Three meters per second times four seconds would be 12 meters. But what if it were the other way around? What if I had another velocity function? Let's call that v sub two of t that is equal to negative two meters per second.