Question

Clasa a VI-A!

La campionatele Mondiale de la Tokyo Carl Lew a stabilit recordul mondial la 100m plat, parcurgand aceasta distanta in 9,86 s. Calculeaza viteza media in m/s si in km/h

Answer 1

d= 100m
Δt = 9,86s
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Viteza medie
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$V = \frac{Distanta}{TImp}$

$V= \frac{100}{9,86} = 10,14 m/s$

$10,14 \frac{m}{s} = 10,14* \frac{1/1000Km}{1/3600} = \frac{10,14/1000}{1/3600} = \frac{10,14}{1000} * \frac{3600}{1} = \frac{36504}{1000} \\ \\ =36,504km/h$

SAU se mai putea face asa :

Daca intr-o secunda face 10,14m/s => o ora = 10,14*3600 = 36504m/h = 36,504km/h 

Recomand prima varianta pentru siguranta maxima.