MY QUESTION:

At which instances/sections of the sprint where acceleration and/or velocity remained relatively constant? At what section/stage of the sprint would we prefer our runners to maintain constant velocity? At what section/stage of the sprint would we prefer our runners to maintain constant acceleration?

ANSWER QUESTION USING THIS DATA:

\fN3 T U Usain Bolt (London 2012) Participant 1 Alex Participant 2 Tyus Participant 3 Jess Participant 4 Erin 2 Velocity (m/s) Acceleration (m/s') Displacement (m) Accum Time (s) Velocity (m/s) Acceleration (m/$2) ment (m) Accum Time (s) Velocity (m/s) Acceleration (m/s') Displacement (m) Accum Time (s) Velocity (m/s) Acceleration (m/s) Displacement (m) Accum Time (s) Velocity (m/s) Acceleration (m/s ) Displacement (m) Accum Time (s) 0 0 0 0 0 0 0 0 0 4 10 1.91 6.85 3.55 L.02 5.71 5 60 1.12 5.13 3.40 5 1.57 4.31 2.97 5 1.16 4.81 5.28 1.86 10 2.32 6.90 1.56 10 2.08 10.99 3.44 2.92 10.36 2.27 10 1,75 9.80 1.88 10 1.95 6.62 20 6 30 0.79 2.04 7.63 -2.36 15 2.63 7.94 1.09 15 3,02 6.58 -0.03 15 2.07 7.94 -4.71 3.84 11.24 3.34 4.98 0.21 7 40 47 11.76 0.48 20 3.06 6.71 1.15 20 3.21 8.00 0.47 20 3.84 6.85 0.12 20 1.20 25 4.08 7.52 3.85 8 50 5.54 12.05 0.30 25 3.53 9.35 3.67 25 3.88 7.35 -1.40 25 4.48 6.76 10.10 1,04 60 12.27 30 30 6.36 0 18 4.13 10.64 4.62 30 4 57 6.10 0.21 30 5.32 8.62 0.33 4.67 7.17 35 4.47 14.29 -3.44 35 5.52 7.69 1.67 35 5.64 6.37 -2.32 35 5.07 8.55 -3.78 10 70 12.35 0.00 40 4.83 7.41 .9.98 40 5.87 8.26 -0.32 40 6.89 4.98 -0.02 40 5.84 5.68 -0.88 11 80 7.98 12.27 0.14 45 5.82 7.30 45 6.73 7.30 45 6.33 6.83 6.99 12 90 7.65 45 8.8 12.12 7.27 13 100 9.63 50 67 50 7.24 8.47 14 15 16 17 18 19 20 8.00 60 6.00 50 4.00 2.00 40 E 0.00 -Usain Bolt Usain Bolt 45 --Alex Acceleration (m/s ?) 30 -2.00 -Tyus Trus Velocity (m/s) -Usain Bolt * less Alex 4.00 Erin 20 Erin Tyus -6.00 Chart -*less -8.00 10 -Erin 10.00 10 20 30 40 50 -12.00 60 Displacement (m) Time (sec) Displacement (m) 48 49 50 51 52 53