Przez most o dlugosci 200m przejezdza z szybkoscia 54km/h pociag o dlugosci 70m. Ile czasu pociag pozostaje na moscie ?
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v=s/t
v=54 km/h*1000m/3600s=15m/s
s=200 m
t=s/v=13,3 s
13,3s---200m
x----70m
x=200m*13.3s/70m
x=38s
odp.Pojedzie 38 sekund