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s1= 0,5 h * 30 km/h = 15 km
s2 = 1,5 h * 50 km /h = 75 km
Vśr = droga całkowita / czas całkowity
V śr = 90km/2 h = 45 km/h
30km/h=s/0,5h
s=30km/h *o,5h=15km
v=s/t
50km/h=s/1,5h
s=50 *1,5=75km
v srednia -całkowita droga/całkowity czas
v 15km+75km/0,5h+1,5h
v=37,5km/h
Dane:
v1 = 30km/h
t1 = 0,5h
v2 = 50km/h
t2 = 1,5h
s = v * t
s1 = v1 * t1 = 15km
s2 = v2 * t2 = 75km
v = s/t
vśr = s1+s2 / t1+t2 = 15km + 75km / 0,5h + 1,5h = 90km/2h = 45km/h
45km = 45 000m
1h = 3600s
vśr = 45000m/3600s = 12,5m/s
Prędkość średnia wyniesie 45km/h, 12,5m/s