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V = a*t
t = V/a
V = 90km/h
V = (90*(5/18))m/s
V = 25m/s
t = 25m/s:10m/s²
t = 2,5s
zadanie 2
z zasady zachowania energii:
Ep = Ek
mgh = mV²/2 |*2
2mgh = mV² |:m
2gh = V² |:2g
h = V²/2g
h = (100m/s*100m/s)/(2*10m/s²)
h = 10000m²/s²:20m/s²
h = 500m
Jak masz pytania to pisz na pw ;)