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v₁ = 40km/h ................................................... t = ?
v₂ = 0km/h
a = 2 m/s²
Δv = 40km/h ≈ 11m/s
a = Δv : Δt
t = Δv : a = 11m/s : 2m/s² = 5,5 s
Odp.: Hamowanie zajmie kierowcy 5,5 sekundy.