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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.
Hines also had a wind-assisted 9.8 s in the heats. [7] Hines went on to win the 1968 Olympic 100m in 9.9 s, rounded down from his FAT of 9.95, making it the first non-wind-assisted electronic sub-10-second performance. [2] By 1976, six other men had equalled the 9.9 s hand-timed record, though none of their performances had an FAT mark. [2]
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.
To help compare different orders of magnitude, the following list describes various speed levels between approximately 2.2 × 10 −18 m/s and 3.0 × 10 8 m/s (the speed of light). Values in bold are exact.
kn/s ≡ 1 kn/s ≈ 5.1 4 × 10 −1 m/s 2: metre per second squared (SI unit) m/s 2: ≡ 1 m/s 2 = 1 m/s 2: mile per hour per second: mph/s ≡ 1 mi/(h⋅s) = 4.4704 × 10 −1 m/s 2: mile per minute per second: mpm/s ≡ 1 mi/(min⋅s) = 26.8224 m/s 2: mile per second squared: mps 2: ≡ 1 mi/s 2 = 1.609 344 × 10 3 m/s 2: standard gravity: g ...
One estimate suggests times in the 200 m sprint can be assisted by between 0.09s and 0.14s with the maximum allowable tailing wind of 2.0 m/s, and gain 0.3s at altitudes over 2000m. [14] For this reason, unofficial low-altitude record lists have been compiled.
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).
For example, if a distance of 80 kilometres is driven in 1 hour, the average speed is 80 kilometres per hour. Likewise, if 320 kilometres are travelled in 4 hours, the average speed is also 80 kilometres per hour. When a distance in kilometres (km) is divided by a time in hours (h), the result is in kilometres per hour (km/h).