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The speed. Also, if a positive slope represents the speed in one direction, the negative slope is the speed in the opposite direction.
It is the instantaneous speed in the direction in which the displacement is measured.
The slope of the speed/time graph is the magnitude of acceleration. (It's very difficult to draw a graph of velocity, unless the direction is constant.)
the slope show the velocity of the object which show its direction and magnitude.
downward as they proceed from left to right across a graph