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[3] [4] Hayes clocked another illegal 9.9 s (wind 5.3 m/s (12 mph)) in the semi-final of the 1964 Olympic 100 m, with the first sub-10 FAT of 9.91 s. [5] In the final, Hayes' official tenths time of 10.0 s was calculated by rounding down the FAT of 10.06 s; the backup hand-timers recorded 9.8, 9.9, and 9.9, which would have given 9.9 s as the ...
For comparison, the fastest known 400m lap was skated by Jenning de Boo on 25 January 2025 in Salt Lake City during a 1000-meter, with a lap time of 23.92 seconds and an average speed of 60.20 km/h (37.41 mph).
Hayes' official time of 10.0 seconds was determined by rounding down the electronic time of 10.06 to the nearest tenth of a second, giving the appearance of a manual time. This method was unique to the Olympics of 1964 and 1968, and the officials at the track recorded Hayes' time as 9.9 seconds.
At the 2021 Prefontaine Classic, Thompson-Herah set another 100 m personal best, Jamaican and Diamond League record of 10.54 s, becoming the first woman to break the 40 km/h barrier, then ran times of 10.64 s and 10.65 s.
100 m: 10.09 (+0.8 m/s) Muhd Azeem Fahmi: 1 August 2022 World U20 Championships: Cali, Colombia 18 years, 94 days [67] 10.0 h: Watson Nyambek: 3 May 1998 Vietnam Open Championships Hanoi, Vietnam 22 years, 65 days [68] 200 m: 20.77 (+2.0 m/s) Russel Taib: 23 March 2019 Queensland Track Classic Brisbane, Australia 20 years, 352 days [69] 20.7 h ...
SI, and hence the use of "km/h" (or "km h −1 " or "km·h −1 ") has now been adopted around the world in many areas related to health and safety [36] and in metrology [37] in addition to the SI unit metres per second ("m/s", "m s −1 " or "m·s −1 "). SI is also the preferred system of measure in academia and in education.
As an exception, according to rule 36.2, specific event organizers may choose to ignore wind velocity readings exclusively for their specific event records (e.g. a performance in a 100 m race at a meeting with a wind reading of +2.4 m/s may be considered that specific meeting record, but will not be considered as a world record). [1]
= 5.08 × 10 −3 m/s: foot per second: fps ≡ 1 ft/s = 3.048 × 10 −1 m/s: furlong per fortnight: ≡ furlong/fortnight ≈ 1.663 095 × 10 −4 m/s: inch per hour: iph ≡ 1 in/h = 7.0 5 × 10 −6 m/s inch per minute: ipm ≡ 1 in/min = 4.2 3 × 10 −4 m/s inch per second: ips ≡ 1 in/s = 2.54 × 10 −2 m/s: kilometre per hour: km/h ...