Question

d-distanta
V-viteza
Jumatate din distanta o parcurge cu v1=80km/h
Cealanta jumate cu v2=40km/h
Aflati Viteza medie


Va rog urgebt

Answer 1

Răspuns:

d¹=d/2

d²=d/2

d²+d¹=d

t¹=d¹/v¹=d/2/v¹=d/2v¹

t²=d²/v²=d/2/v²=d/2v²

t=t¹+t²

d=vm*t=>vm=d/t=d(t¹+t²)=d/(d/2v¹+d/2v²)=d/[d(1/2v¹+1/2v²)]=1/(1/2v¹+1/2v²)=2v¹v²/(v¹+v²)=2*80*40/(80+40)=6400/120=53,33 km/h

Sper că te-am ajutat!