A speed graph measures the distance devided over time. Acceleration graph measures the change in speed over time.
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On speed-time graph can measure acceleration by getting the slope.
The acceleration of an object.
Constant speedThe graph you described is a speed-time plot. If the line is horizontal, that indicates no change in speed over time. In other words, there is no acceleration (acceleration is zero), since there is no change in speed.
On a graph of acceleration vs. time, during deceleration the line is below zero. On a graph of speed vs. time, during deceleration the line has a negative slope (sloping downward from left to right).
My interpretation is that the car and any motion, like the graph, do not exist.