Odpowiedzi

2010-02-02T17:31:53+01:00
Dane:
V₁ = 24 km/h = 24 000 m /3600 s = 6,66 m/s
V₂ = 12 km /h = 12 000 m / 3600 s = 3,33 m/s
t₁ = 20 min = 1200 s
t₂ = 10 min = 600 s
Rozw.:
S₁ = V₁ × t₁ = 6,66 m/s × 1200 s = 7992 m
S₂ = V₂ × t₂ = 3,33 m/s × 600 s = 1998 m
V = S₁+S₂ /t₁ + t₂ = 7992 m + 1998m / 1200 s + 600 s = 5,55 m/s