On the performance of Usain Bolt in the 100 metre sprint
J.J. Hern\'andez G\'omez, V. Marquina, R.W. G\'omez

TL;DR
This paper develops a theoretical model to analyze Usain Bolt's 100m sprint performance, considering drag forces proportional to both velocity and its square, and fits it to experimental data from the 2009 World Championships.
Contribution
It introduces a novel model incorporating both linear and quadratic drag forces to better understand sprint performance, validated with real-world data.
Findings
Model accurately fits Bolt's sprint data
Drag forces significantly influence sprint dynamics
Model applicable mainly to short-distance sprints
Abstract
Many university texts on Mechanics deal with the problem of the effect of the air drag force, using as example the slowing down of a parachute. Hardly no one discuss what happens when the drag force is proportional to both and . In this paper we deal with a real problem to illustrate the effect of both terms in the speed of a runner: a theoretical model of the performance of the 100 m world record sprint of Usain Bolt during the 2009 World Championships at Berlin is developed, assuming a drag force proportional to and to . The resulting equation of motion is solved and fitted to the experimental data obtained from the International Amateur of Athletics Federations that recorded Bolt's position with a LAVEG (laser velocity guard) device. It is worth to note that our model works only for short sprints.
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