Hej ;)
Wyraź
92km/h w m/s
25m/s w km/h
36km/h w m/s
7m/s w km/h
oraz
samochod wyjechal z miescowosci A do B,polowe podrozy jechal z predkoscia 40km/h a pozniej z szybkoscia 80km/h.Oblicz predkosc srednia samochodu z pkt A do B
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zad 1
92km/h = 92 * 1000/3600 = 92000/3600 = 25,6 m/s
25m/s = 25 * 3600/1000 = 90km/h
36km/h = 36 * 1000/3600 = 36000/3600 = 10 m/s
7m/s = 7 * 3600/1000 = 25,2 km/hzad 2
zad 2
V₁ = 40 km/h
V₂ = 80 km/h
Vśr = 2V₁V₂/(V₂ + V₁) = 2 * 40 * 80/(80 + 40) = 6400/120 = 53,3 km/h