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Abbreviations for "kilometres per hour" did not appear in the English language until the late nineteenth century. The kilometre, a unit of length, first appeared in English in 1810, [9] and the compound unit of speed "kilometers per hour" was in use in the US by 1866. [10] "Kilometres per hour" did not begin to be abbreviated in print until ...
Land speed records by surface Category Speed (km/h) Speed (mph) Vehicle Operator Date Certifier Refs On ice: 335.7: 208.6: Audi RS 6: Janne Laitinen 9 Mar 2013
Prior to 2009, a speed limit could be defined in kilometers per hour (km/h) as well as miles per hour (mph). The 2003 version of the MUTCD stated that "speed limits shown shall be in multiples of 10 km/h or 5 mph." [118] If a speed limit sign indicated km/h, the number was circumscribed and "km/h" was written below. Prior to 2003, metric speed ...
La Jamais Contente on display at the Paris Motor Show 2018 "La Jamais Contente" Detail: rear wheel, reconstruction of Museum Autovision, Altlußheim, Germany. La Jamais Contente (French pronunciation: [la ʒamɛ kɔ̃tɑ̃t]; English: The Never Contented) was the first road vehicle to go over 100 kilometres per hour (62 mph).
The record is 44.72 km/h (27.78 mph), measured between meter 60 and meter 80 of the 100 meters sprint at the 2009 World Championships in Athletics by Usain Bolt. [4] [5] (Bolt's average speed over the course of this race was 37.578 km/h or 23.35 mph.) [6] Compared to quadrupedal animals, humans are exceptionally capable of endurance, but incapable of great speed. [7]
60 kilometres per hour (37 mph) 80–120 kilometres per hour (50–75 mph) 80–120 kilometres per hour (50–75 mph) 10 mph (16 km/h)
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).
By 0–100 km/h (62 mph) time (3.0 s or less) [ edit ] These are standing start (no rollout allowed) acceleration times measured by independent, reliable sources (thus these are not precisely comparable with the first table where even 9.5-96.6 km/h times are allowed).