In 2011, another world record was set in marathon running: the runner ran a distance of 42 km 195 m

| May 15, 2021 | education

In 2011, another world record was set in marathon running: the runner ran a distance of 42 km 195 m in 2 hours 3 minutes 38 seconds. And the 2009 world record in the 100m race was 9.58 seconds. Assuming that in both cases the runners were moving evenly, find the speed of each of them (in m / s).

These tasks: S1 (the length of the marathon distance, covered by the first runner) = 42 km 195 m (in SI S1 = 42 000 + 195 m = 42 195 m); t1 (time of the first runner) = 2 h 3 min 38 s (in SI t1 = 2 * 3600 + 3 * 60 + 38 s = 7418 s); S1 (distance covered by the second runner) = 100 m; t2 (second runner’s time) = 9.58 s; the movement of the runners is considered uniform.

1) The speed of the first runner: V1 = S1 / t1 = 42195/7418 = 5.688 m / s.

2) The speed of the second runner: V2 = S2 / t2 = 100 / 9.58 = 10.438 m / s.



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