vertical height over lengh
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The gradient of a distance-time graph gives the object's speed.
Force
A gradual change in the gradient (slope).
Y divided by X axix- Y/X
basically the reciprocal of the original lines gradient is going to be the gradient for the perpendicular line (remember the signs should switch). For example if i had a line with the gradient of 3, then the gradient of the perpendicular line will be -1over3. But if the line had the gradient of -3, then the line perpendicular to that line will have the gradient 1over3.