Final answer:
The area between the line and the X axis on a velocity versus time graph signifies the object's displacement, which is the total distance moved in a specific direction.
Step-by-step explanation:
The area between the line and the X axis on a velocity versus time graph represents the displacement of an object. Displacement can be determined by finding the area under the line in the velocity vs. time graph. This means that when you calculate the area between the velocity curve and the time axis, you are calculating the total distance that an object has moved, accounting for the direction. This is in contrast to the slope of a velocity vs. time graph, which shows the acceleration of the object.