t = 4 s
V = 72 km/h = 72*1000 m/3600 s = 20 m/s
V₀ = 0 ; bo samochód rusza z miejsca
s = ?
s = V₀t + a *t²/2 ; ale V₀= o
s = a *t²/2
a = ΔV/t
ΔV = V - V₀ ale V₀ = 0
a = V - V₀/t
a = V/t ; wstawiam do wzoru na drogę
s = V/t * t²/2
s = V * t/2
s = 20 m/s * 4 s /2
s = 40 m
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t = 4 s
V = 72 km/h = 72*1000 m/3600 s = 20 m/s
V₀ = 0 ; bo samochód rusza z miejsca
s = ?
s = V₀t + a *t²/2 ; ale V₀= o
s = a *t²/2
a = ΔV/t
ΔV = V - V₀ ale V₀ = 0
a = V - V₀/t
a = V/t ; wstawiam do wzoru na drogę
s = V/t * t²/2
s = V * t/2
s = 20 m/s * 4 s /2
s = 40 m