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b) 0,13 m/s
c)120 000 m/s
d) 0,1 m/s
2. v=s/t
v=42km/0,25h
v=168km/h
1km=1000m
1h=3600s
1min=60s
1m=10dm
a).160km/h=160*1000/3600=44,4m/s
b).80dm/min=80*1/10*1/60=0,1(3)m/s
c).120km/s=120000m/s
d).60dm/min=60*1/10*1/60=1/10=0,1m/s
Zad.2
s-droga
V-prędkość
t-czas
Dane:
s=42000m=42km
t=15min=0,25h
Szukane:
v=?
V=s/t
V=42km/0,25h
V=168km/h
odp.Prędkość tej motorówki wynosi 168km/h.