 A very useful tool when analyzing kinematics problems is the position time graph. What does the position time graph do? Well, we plot on the y-axis the position and on the x-axis the time. So for any moment in time, we're going to plot where was the object. For example, if I have an object that starts at position A and takes four seconds to go to position B, I can plot this here that at time equals zero. I was at position A, which is here, and four seconds later, one, two, three, four seconds later, I was at position B, so I was here. I don't know what happened in between, so let's assume the simplest case and we just connect those two at the straight line. So now we could get a good estimation. Where was the object at two seconds? At two seconds it must have been about at three meters. Three seconds around four meters and so on and so on. Now if we go one way by movement here, let's assume after we reach point B, the object was staying at B for two seconds. So for two seconds, absolutely nothing was happening. So we had four was here, five, six, two seconds, absolutely nothing was happening. So the object remained at the same position. And then finally let's assume we took this three seconds, two seconds to go back to the initial position. So it will take us another two section to go back to here. And here's my first example of a position time graph. And now I can know really for any moment in time where exactly the object was.