straight line
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The graph is a straight line. Its slope is the speed.
A horizontal line on a speed vs time graph indicates constant speed.
That kind of depends on what is being graphed. -- On a graph of acceleration vs time, the graph is a straight line that lays right on top of the x-axis, because the acceleration is a constant zero. -- On a graph of speed vs time, constant speed is a horizontal line, parallel to the x-axis. -- On a graph of distance vs time, constant speed is a straight line with a positive slope; that is, it rises as it progresses toward the right.
yes
By using the distance, speed, and acceleration, to show on the graph the constant speed of each car