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Investigation 6.1 Motion of a sprinter during a 100m run Distance moved (m) Time at this point (sec) Time interval for previous 10m (sec) 0 0 0 10 2.50 2.50 20 3.65 1.15 30 5.06 1.41 40 6.50 1.44 50 7.83 1.33 60 9.48 1.65 70 11.90 2.42 The runner starts off slowly and her speed builds up. This is the curve at the bottom of the graph between 0 and 3 seconds it shows that she is accelerating. Her speed is quite consistent between 3 and 9 seconds. This is the relatively straight part in the middle of the graph. After nine seconds her speed reduces slightly until she reaches the end. This is the curve at the top of the graph and it she that she is decelerating. The gradient at 1.0 seconds is; 51.6 = 3.125 The gradient at 5.0 seconds is; 81.2 = 6.6 These values show that he runner is faster at seconds then at 1 second, as the gradient at 5 seconds is much steeper. Section of race (m) Speed for the section (ms-1) Time at the middle (sec) 0-10 4 1.25 10-20 8.7 3.075 20-30 7.09 4.355 30-40 6.94 5.78 40-50 7.52 7.165 50-60 6.06 8.655 60-70 4.13 10.675 In...

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