It means there is no movement towards or away from the point from which distances are measured - usually the origin. The object can be moving in a transverse direction at any speed and the graph would not show it.
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A horizontal line on a distance vs time graph means that you are not moving, instead you are staying at one spot.
A straight horizontal one does.
It means there is no velocity - it is at rest and nothing is moving. The slope of the line is velocity - a horizontal line is zero slope = zero velocity
constant speed
it depends on what the graph is. if it is a distance vs time graph, the line will be a line with the slope being the speed/total time if it is a speed vs. time graph, the line will be horizontal at y=the speed if it is an acceleration vs time graph, the line will be horizontal at y=0
A horizontal line.