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Miles per hour (mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour. It is used in the United Kingdom , the United States , and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.
The first numeric speed limit for automobiles was the 10 mph (16 km/h) limit introduced in the United Kingdom in 1861. [3] As of 2018 the highest posted speed limit in the world is 160 km/h (99 mph), applied on two motorways in the UAE. [4]
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 many years later, with several different abbreviations existing near-contemporaneously.
The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in vacuum c = 299 792 458 metres per second (approximately 1 079 000 000 km/h or 671 000 000 mph).
Its symbol is m/h or m·h −1 (not to be confused with the imperial unit symbol mph). By definition, an object travelling at a speed of 1 m/h for an hour would move 1 metre. The term is rarely used however as the units of metres per second and kilometres per hour are considered sufficient for the majority of circumstances. Metres per hour can ...
In an effort to reduce the speed disparity between the classes, the Automobile Club de l'Ouest (ACO) lifted its minimum average speed for qualification, from 160 km/h (99 mph) to 190 km/h (120 mph). They also now required all cars to qualify to be within 85% of the pole-position car’s average speed. [ 2 ]
His four-seam fastball averaged 100.2 mph and topped out at 102.0 mph, with Dodgers hitters whiffing 13 times on 28 swings, in addition to 10 called strikes.
The concept car, which is a demonstration of an all-electric motorsports vehicle similar to ones used in Formula E racing, shares its powertrain with the Ariya SUV. The concept also shares multiple design cues with its SUV counterpart, including the illuminated "V" shape at its front and its overall form, which, according to Nissan, "looks like ...