Question

Janek przejechał motorem z domu do sklepu 4 km w ciagu 2 minut ,a nastepnie ze sklepu do kolegi 400 m w ciagu 100 s .Blicz srednia predkosc ruchu motorowerem.

Answer 1

dane: 

s1 = 4 km = 4000 m 

t1 = 2 min = 120 s 

s2 = 400 m 

t2 = 100 s 

szukane: 

vśr = ? 

 

vśr = s/t = (s1+s2)/(t1+t2) = (4000m+400m)/(120s+100s) = 4400m/220s = 20 m/s 

vśr = 20 m/s 

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