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0.02 mach is about two-thirds as fast as Usain Bolt.
In other words, it's 0.6440 times the speed of Usain Bolt, and the speed of Usain Bolt is 1.550 times that amount.
(at the Beijing Olympics, 2008) (a.k.a. Usain St. Leo Bolt, OJ, C.D.) (sprinter; 1986-)
Setting a world record, Usain Bolt ran a 100 m in 0:09.69 for an average speed of 0.0312 mach at the 2008 Olympics. Furthermore, Bolt's margin of record breaking — 0.03 s — is the largest margin of victory in the history of digital measurements.
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