Rowerzysta przejechał 2/3 trasy z prędkością 20km/h, a następne 1/3 trasy z prędkością 10km/h. Jaka jest średnia prędkość rowerzysty? Pokażcie jak liczycie.
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dane:
s1 = 2s/3
v1 = 20 km/h
s2 = s/3
v2 = 10 km/h
s = s1+s2
szukane:
vśr = ?
vśr = s/t
t = t1+t2
t = v/s
t1 = s1/v1 = 2s/3 // 20 = 2s/60 = s/30 [h]
t2 = s2/v2 = s/3//10 = s/30 [h]
t = s/30 + s/30 = 2s/30 = s/15 [h]
vśr = s//s/15 [km/h]
vśr = 15 km/h
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