The vertical axis gives the distance of an object from a fixed point - the point of reference - after a time, as measured on the horizontal axis.
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Average Velocity
It tells the time and location of the object that you are tracking at one point in time.
It tells you that the speed of the object is not changing. The speed is represented by the slope in a distance vs. time graph, if slope doesn't change, speed doesn't.
It tells you that the velocity of the body is not constant. There is acceleration or deceleration.
The abscissa.