Odpowiedzi

2009-12-03T19:22:09+01:00
T = (1/24)h + (1/60)h = (7/120)h
V = 3km / (7/120)h = 51,4 km/h
2009-12-03T19:34:23+01:00
T=S:V
T= 3000m : 20 m/s=150s
T=150s

vś= S:T
s= 3000m
T= 150s+8*60s=630s

Vś= 3000:630s≈4,76m/s
czyli srednia predkosc wynosi 4,76 m/s lub 4,76 * 3.6≈17 km/h