As of 20 August 2008, Usain Bolt is the the world's fastest man with a 200 meter sprint of 19.30 seconds, giving an average speed of 10.36 meters per second. There are 1609.344 meters in a mile, so 10.36 m/s / 1609.344 m/mi = 0.0064374 miles/second. There are 3600 seconds in an hour, so 0.0064374 mi/s * 3600 s/hr = 23.175 miles/hour. Usain Bolt clocked an *average* speed of 23.175 mph during his world record run, however he may have achieved speeds of 23-27 mph in the early part of the sprint.
The U.S. is growing, and the world is growing faster. (Andreas Kermann/iStockphoto) The U.S. entered 2016 with an estimated population of 322,762,018 according to an end-of-year estimate from the U.S. Census Bureau, meaning that we added more than 2.4 million people to the population over the course of the year.
As of the 2010 United States Census, the city's population was 8,411, reflecting an increase of 773 (+10.1%) from the 7,638 counted in the 2000 Census, which had in turn increased by 340 (+4.7%) from the 7,298 counted in the 1990 Census.