Odpowiedzi

2009-11-18T17:35:30+01:00
S = s₉ + V₀t + 0,5at²
s₀ = 0
V₀ = 54km/h
a = ΔV/Δt
ΔV = V - V₀ = -V₀
Δt = t = 2s
a = -V₀/t
s = V₀t - 0,5 V₀t²/t = V₀t - 0,5V₀t = 0,5V₀t
V₀ = 54km/h = 54*1000/3600 m/s = 15m/s
s = 0,5*15*2 m = 15m