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She ran the 800 meters at the 2012 United States Olympic Trials and placed 18th, and also ran at the 2012 World Junior Championships in Athletics, where she broke the American high school girl's outdoor record in the 1500 m with a 4:11.01, surpassing the record of Jordan Hasay in the 2008 United States Olympic Trials by over 3 seconds.
Generally, in Earth's atmosphere, all results below will therefore be quite inaccurate after only 5 seconds of fall (at which time an object's velocity will be a little less than the vacuum value of 49 m/s (9.8 m/s 2 × 5 s) due to air resistance).
The official height of the hurdles was set to 36 inches (91.4 cm). ... 400 time and their 400 hurdles time should be between 1.5 to 3 seconds. This variation depends ...
The world record in the 100-meter dash in 1924 was 10.4 seconds, while in 1948, (the first use of starting blocks) was 10.2 seconds, and was 10.1 seconds in 1956. The constant drive for faster athletes with better technology has brought man from 10.4 seconds to 9.58 seconds in less than 100 years.
1.6 × 10 −5 quectometers (1.6 × 10 −35 meters) – the Planck length (Measures of distance shorter than this do not make physical sense, according to current theories of physics.) 1 qm – 1 quectometer, the smallest named subdivision of the meter in the SI base unit of length, one nonillionth of a meter.
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In terms of judging a person's speed, the best method of timing is through lasers which start and stop the times when passed through. A laser start (from a stationary position) is more accurate for measuring pure speed as it does not register a runner's reaction time, however, this method of timing a 40-yard dash can affect the accuracy by as much as 0.5 seconds with the manual stopwatch method.