Usain Bolt could be described as 'running as fast as the wind' during the 100m race. But what kind of wind blows at such speed?
Top speed of Usain during setting up the 2009 100m world record was 12.3 m/s. This corresponds to the 6 on the Beaufort scale. During such wind conditions, large branches are in motion and whistling is heard in overhead wires.
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