Speed (in the radial direction) = slope of the graph.
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The graph of distance vs time increases exponentially as speed increases.
A distance-time graph is created by placing the distance on the vertical axis with the time placed on the horizontal axis. The values can then be plotted using distance traveled on different intervals.
A speed graph measures the distance devided over time. Acceleration graph measures the change in speed over time.
Speed is distance divided by time so pick the section you want to work out the average for, work out how much distance has been traveled in that section and divide it by how much time has passed for that section.
The gradient of a distance-time graph gives the object's speed.