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The official height of the hurdles was set to 36 inches (91.4 cm). The hurdles are now placed on the course with a run-up to the first hurdle of 45 metres, distance between the hurdles of 35 metres each, and home stretch from the last hurdle to finish line of 40 metres.
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.
For example, while sound travels at 343 m/s in air, it travels at 1481 m/s in water (almost 4.3 times as fast) and at 5120 m/s in iron (almost 15 times as fast). In an exceptionally stiff material such as diamond, sound travels at 12,000 m/s (39,370 ft/s), [ 2 ] – about 35 times its speed in air and about the fastest it can travel under ...
3.2808 The metre per second is the unit of both speed (a scalar quantity ) and velocity (a vector quantity , which has direction and magnitude) in the International System of Units (SI), equal to the speed of a body covering a distance of one metre in a time of one second .
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.
By that time, 27-inch hurdles were embedded in the rulebook. Women also do the 300 hurdles, W50 to W65 divisions. Like the men, the W50 and W55 divisions do 30-inch hurdles, W60 and W65 do 2 ft 3 in (0.68 m) (27 inch) hurdles, and W70+ do the 200-metre version over 27-inch hurdles. Occasionally the event is held for top level athletes.
The current men's world record and Olympic record is held by Wayde van Niekerk of South Africa; his time of 43.03 seconds is the fastest 400 m ever run, in either an open 400 m or a relay. While Michael Johnson holds the fastest 400 m relay split with a time of 42.94, relay splits are typically faster because athletes have a running start and ...
T. Jones #3: 4 February 2024 Boston [25] Charlton #4: 3 March 2024 Glasgow [26] 9: 19: 7.73: Cornelia Oschkenat East Germany: 25 February 1989: Vienna: Sally Pearson Australia: 10 March 2012: Istanbul: 7.73 A: Christina Manning United States: 18 February 2018: Albuquerque [22] 19 7.73 A: Nugent #2: 11 March 2023 Albuquerque [27] 9 19 7.73 ...