Question = The 10-second barrier is a term used in track and field athletics, which refers to the physical and psychological barrier of completing the men's 100 metres sprint in under ten seconds. The achievement was traditionally regarded as the hallmark of a world-class sprinter. Its significance has become less important since the late 1990s, as an increasing number of runners have surpassed the ten seconds mark.For sprints, the International Association of Athletics Federations (IAAF) rules for world records and other recognised performances require: a wind assistance of not more than ____________ in the direction of travel; fully automatic timing (FAT) to one hundredth of a second; and no use of performance-enhancing substances.Wind gauge malfunctions or infractions may invalidate a sprinter's time ?
Answer= Two metres per second (7.2 km/h)
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