As of 2/07/10:
The present world record for 100 meters is 9.58 seconds, set 8/16/09 at Berlin by Usain Bolt.
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There are 100 centimetres.
100 meters in 11.8 seconds = 18.96 miles per hour.
100 meters in 9.69 seconds is 23.3 miles per hour.
s=d/ts= 100 / 12s= 8.33ms-1
a 60 meters