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  2. Equations for a falling body - Wikipedia

    en.wikipedia.org/wiki/Equations_for_a_falling_body

    The first equation shows that, after one second, an object will have fallen a distance of 1/2 × 9.8 × 1 2 = 4.9 m. After two seconds it will have fallen 1/2 × 9.8 × 2 2 = 19.6 m; and so on. On the other hand, the penultimate equation becomes grossly inaccurate at great distances.

  3. 40-yard dash - Wikipedia

    en.wikipedia.org/wiki/40-yard_dash

    In terms of judging a person's speed, the best method of timing is through lasers which start and stop the times when passed through. A laser start (from a stationary position) is more accurate for measuring pure speed as it does not register a runner's reaction time, however, this method of timing a 40-yard dash can affect the accuracy by as much as 0.5 seconds with the manual stopwatch method.

  4. 400 metres hurdles - Wikipedia

    en.wikipedia.org/wiki/400_metres_hurdles

    The official height of the hurdles was set to 36 inches (91.4 cm). ... 400 time and their 400 hurdles time should be between 1.5 to 3 seconds. This variation depends ...

  5. Highest falls survived without a parachute - Wikipedia

    en.wikipedia.org/wiki/Highest_falls_survived...

    Suffered many bone fractures. [1] [2] [3] Luke Aikins: 25,000 [4] 7,620 2016 On July 30, 2016, Aikins jumped from an aircraft without any parachute or wingsuit at an altitude of 25,000 feet (7,620 m) above Simi Valley, California, watched by a live audience. After about two minutes of free fall he successfully landed in a 100-by-100-foot (30 by ...

  6. Sprint (running) - Wikipedia

    en.wikipedia.org/wiki/Sprint_(running)

    The world record in the 100-meter dash in 1924 was 10.4 seconds, while in 1948, (the first use of starting blocks) was 10.2 seconds, and was 10.1 seconds in 1956. The constant drive for faster athletes with better technology has brought man from 10.4 seconds to 9.58 seconds in less than 100 years.

  7. Metre per second - Wikipedia

    en.wikipedia.org/wiki/Metre_per_second

    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 .

  8. List of humorous units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_humorous_units_of...

    One barn is equal to 1.0 × 10 −28 m 2. The name derives from the folk expressions "As big as a barn," and "Couldn't hit the broad side of a barn", used by particle accelerator physicists to refer to the probability of achieving a collision between particles. For nuclear purposes, 1.0 × 10 −28 m 2 is actually rather large. [25]

  9. Preferred walking speed - Wikipedia

    en.wikipedia.org/wiki/Preferred_walking_speed

    Many people tend to walk at about 1.42 metres per second (5.1 km/h; 3.2 mph; 4.7 ft/s). [1] [2] [3] Individuals may find slower or faster speeds uncomfortable. Horses have also demonstrated normal, narrow distributions of preferred walking speed within a given gait, which suggests that the process of speed selection may follow similar patterns ...