The following record shows how far a runner was from the starting point at every 2s of a 10s dash.
Time t (s): 0 2 4 6 8 10
Distance s (m):\; 0 8 16 25 40 60
(i) Determine the displacement covered in each successive 2s interval.
(ii) Identify all time intervals, if any, during which the runner moved with uniform motion. Give a reason for each identification.
(iii) Calculate the average speed of the runner for the whole 10s run.
(iv) If the runner wishes to cover the same total distance in the same total time but with perfectly uniform motion, calculate the constant speed required and briefly describe how the runner’s pacing must change.