Plot it.
speed at middle of race is the slope of the graph.
You will have to decide what "middle" of race means...at six seconds, or at 52.5 meters.
Show how the displacement of a runner changed during a sprint race.draw a displacement-time graph to show this data, and use it to deduce the runner's speed in the middle of the race.
Displacement (m) 0 4 10 20 50 80 105,
Time(s) 0 1 2 3 6 9 12.
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