At the 2008 Summer Olympics in Beijing, Usain Bolt broke the world record for the 100 m sprint.Just one year later, at the 2009 World Championships in Athletics in Berlin he broke it again. A few months after Beijing, Eriksenet al. Am. J. Phys.77, 224-228 2009 studied Bolt`s performanceand predicted that Bolt could have run about one-tenth of a second faster, which was confirmed in Berlin. In this paper we extend the analysis of Eriksenet al.to model Bolt`s velocity timedependence for the Beijing 2008 and Berlin 2009 records. We deduce the maximum force, themaximum power, and the total mechanical energy produced by Bolt in both races. Surprisingly, weconclude that all of these values were smaller in 2009 than in 2008. Volltext siehe: https://bdpi.usp.br/bitstream/handle/BDPI/16010/art_HELENE_The_force_power_and_energy_of_the_100_meter_sprint_2009.pdf
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