Răspunsuri

2014-11-17T15:46:43+02:00
Viteza1= 15m/s
timpul 2=1h=3600 s
distanta 2= 90km=90 000 m
rezolvare:
v= d/t 
viteza2 =90km/h = 90000m:  3600s = 25 m/s
v medie =v1+v2 / 2= 15m/s+25m/s= 40:2 = 20 m/s
raspuns : 20 m/s
2 5 2