It means that the object in question is travelling at constant speed.
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If you are analyzing speed with respect to time, then you are decelerating.
Constant speed. Zero acceleration.
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.
It means that the speed of the object is constant.
BecAuse that would mean it is going an infinite speed. The slope of a distance time graph is the objects velocity or speed. If there is a line parallel to the distance axis, there is a vertical line. The slope of a vertical line is infinite. It is not possible to go an infinite speed.