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.
Population: Census 2010 Total Population: 19,821: 2010 Demographic Profile: 2016 Population Estimate (as of July 1, 2016) N/A: 2016 Population Estimates: 2016 ACS 5-Year Population Estimate: 20,011: 2012-2016 American Community Survey 5-Year Estimates: Median Age: 45.9: 2012-2016 American Community Survey 5-Year Estimates : Number of Companies: 2,334