So, the displacement of an object is given by the product of the velocity and elapsed time, and is represented by the area of the shaded rectangle in the figure. {{CMD_24}} {{CMD_25}} Since the displacement of an object moving at constant velocity over a time interval can be represented by the area of a rectangle, we can approximate displacement of an object moving at nonconstant velocity using Riemann sums. We explain this process in detail in our next example.