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a = -5m/s²
t = 4s
Vh = at
Vh = -5m/s² * 4s = 20m/s
Vk = Vo - Vh = 25m/s - 20m/s = 5m/s = 18km/h
Odp: Pojazd uderzył w przeszkodę z prędkością 18km/h.
v = v₀ - at
v = 25m/s - 5m/s²×4s = 5m/s
5m/s = 5 × 3600s/1000m = 18 km/h