Distance-time graphs
2 marks · EasyExplain why the slope of a distance–time graph represents speed.
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Must show: Slope = change in distance / change in time, Speed = distance / time
Also accept: Speed is the gradient of the graph, which is rise over run.
Common mistakes: Saying only 'the line is steep'; Explaining only what slope means, not connecting to speed
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that the slope (or gradient) is change in distance over change in time.
B1 · 1 mark · States that speed is distance divided by time (or equivalent).
Worked solution
The slope of a distance–time graph is the change in distance divided by the change in time. This is the definition of speed.