Odpowiedzi

2009-12-02T19:55:35+01:00
A = Δv:Δt

t=5s
v₁ = 18km/h
v₂ = 90km/h

Δv = v₂ - v₁
Δv = 90km/h - 18km/h = 72km/h = 20m/s
a = 20m/s : 5s = 4m/s²