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= 2. 7 × 10 −1 m/s knot: kn ≡ 1 nmi/h = 1.852 km/h = 0.51 4 m/s knot (Admiralty) kn ≡ 1 NM (Adm)/h = 1.853 184 km/h [29] = 0.514 77 3 m/s mach number: M: Ratio of the speed to the speed of sound [note 1] in the medium (unitless). ≈ 340 m/s in air at sea level ≈ 295 m/s in air at jet altitudes metre per second (SI unit) m/s ≡ 1 m/s ...
An Olympic double of 200 m and 400 m was first achieved by Valerie Brisco-Hooks in 1984, and later by Michael Johnson from the United States and Marie-José Pérec of France both in 1996. Usain Bolt is the only man to repeat as Olympic champion, Bärbel Wöckel (née Eckert), Veronica Campbell-Brown and Elaine Thompson-Herah are the three women ...
Thompson-Herah ran a top speed of 39.7 km/h, the fastest speed ever achieved by a female sprinter; the previous top speed was from Griffith-Joyner who reached 39.1 km/h in 1988. [30] Competing at her longer distance, she first equalled her personal best of 21.66 s in the semifinals.
ft/s 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 .
He set a new championship record in the 200 m with a time of 20.40 s, despite a 1.1 m/s (4.0 km/h; 2.5 mph) head wind. [41] Michael Johnson , the 200 m world-record holder, took note of Bolt's potential but worried that the young sprinter might be over-pressured, stating, "It's all about what he does three, four, five years down the line". [ 42 ]
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.
Yohan Blake (born 26 December 1989) is a Jamaican sprinter specialising in the 100-metre and 200-metre sprint races. He won gold at the 100m at the 2011 World Athletics Championships as the youngest 100m world champion ever, and a silver medal in the 2012 Olympic Games in London in the 100m and 200m races for the Jamaican team behind Usain Bolt.
The "Time" column indicates the ratified mark; the "Wind" column indicates the wind assistance in metres per second, 2.0 m/s the current maximum allowable, a negative indicates the mark was set running into a wind; the "Auto" column indicates a fully automatic time that was also recorded in the event when hand-timed marks were used for official records, or which was the basis for the official ...