velocity
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the rate of change on the line.
If the line slants up and to the right, it has a positive slope. If it is slanting up and to the left, it has a negative slope.
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.
Slope at any point is speed. if slope is constant (staight line)then speed is constant; if curved up speed is accelerating. If curved down it is decelerating
That's a horizontal line, with a slope of zero. (You can't see it on the graph, because it lays right on top of the x-axis, and you can't tell that it's there.)