A straight line on a distance - time graph represents a "constant velocity".
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straight line
a sloped straight line
Yes. Speed is the rate at which distance changes over time. In calculus terms v = dx/dt, or the slope of the distance vs. time graph. If the slope of the distance vs. time graph is a straight line, the speed is constant.
It means that the object in question is moving at a constant speed.If the graph is a straight horizontal line, then the speed is zero.
The graph is a straight line. Its slope is the speed.