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t=5s
vp=90km/h
μ=?
Przeliczan na uklad SI
Vp=90km/h=90000m/3600=900/36=150/6=25m/s
Obliczam opoznienie .
a=vp/t
z 2-giej zasady dunamiki F=m*a
F=m*vp/t
μ=T/N stosunek tarcia do nacisku T=F
N=mg ciezar samochodu
μ=vp/(t*g)≈25/(5*10)=0,5
Odp μ=0,5
pozdrawiam