The ratio of the vertical distance to the horizontal distance is sometimes colloquially phrased as "rise over run"; the numerically calculated value is called "slope". Mathematically, slope can be thought of as the tangent (function) of the "angle of elevation".
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It is a measure of the average gradient or slope.
The slope is the ratio of rise over the run. The rise is the change in the vertical distance.The run is the change in the horizontal distance.So the slope is the ratio of two changes, horizontal divided by vertical.
distance-time graph
The absolute difference in the vertical direction is zero but the absolute difference in the horizontal direction will be the horizontal distance - which is the distance between the points.
dy= (v1sinO)2/2gdx= (Vx)(t)