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Motion at a constant speed - no acceleration or deceleration.

Q: What does a flat line represent on a speed time graph?

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The steepness of the line on a distance-time graph represents the radial speed of the object. That is, the speed with which the object is moving towards or away from the origin. The steepness takes absolutely no account of the transverse speed, so you can be going around the origin in a circle at a great speed but, since your distance remains the same, the D-T graph will be flat: implying speed = 0.

A horizontal line on a speed vs time graph indicates constant speed.

Line graph.

If its slanted up its accelerating, if down its decelerating.

A straight line.

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A flat line would indicate a constant velocity, no change in speed.

The gradient (slope) of the line on the graph.

That the object is moving at a constant speed

constant speed

The steepness of the line on a distance-time graph represents the radial speed of the object. That is, the speed with which the object is moving towards or away from the origin. The steepness takes absolutely no account of the transverse speed, so you can be going around the origin in a circle at a great speed but, since your distance remains the same, the D-T graph will be flat: implying speed = 0.

i dont think you can use a line graph for that. i think a table would be better...

it means the object is moving at a 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 on a speed vs time graph indicates constant speed.

Line graph.

Slope of time Vs distance graph gives the inverse of velocity.

Time is plotted on the X-axis. Speed or velocity is plotted on the Y-axis. A straight horizontal line on a speed-time graph means that speed is constant. It is not changing over time. A straight line does not mean that the object is not moving!