It means that the speed of the object is constant.
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Diagonal line
No, if the speed is steadily increasing, the graph will not show a straight diagonal line. Instead, it will show a curve that is sloping upwards, indicating acceleration. This is because as time progresses, the speed is increasing at a constant rate, resulting in a curved line on the graph. A straight diagonal line would indicate a constant speed over time.
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.
No. The distance of a line on a graph will not affect how steep it is. Distance does not affect slope.
It means that the object is moving at a high speed in a direction towards or away from the reference point.