Decomposition of Complicated Motions 
Although it is rare on earth for an object to move continuously with constant velocity, many realistic motions can be decomposed into segments that are well represented by constant velocity motion. By matching the initial conditions of each segment (time and position) to the final conditions of the previous segment, the entire motion can be described using only the simple Law of Change for the One-Dimensional Motion with Constant Velocity model.
Campus Tour (Basic problem to illustrate graphical representation of position and velocity.)