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I've looked at several sources about the average human running speed, and they aren't consistent, but I found that the average human should be able to run 100m in 15 seconds. That's 6.6666m/s. The average human weighs 62kg, so when sprinting, he/she have 1/2*62*6.6666*6.6666=1378 joules of KE, which is Street level, and this obviously doesn't make sense. If we take Usain Bolt's peak speed (12.4m/s) and weight (94kg), we get 1/2*12.4*12.4*94=7226 joules, so the upper limit of Street level seems fine.