Se da:
v1=50km/h
v2=70km/h
d1=d/2
d2=d/2
vm=?km/h
Formule:
[tex]vm= \frac{d}{t}\\
t=t1+t2\\
t= \frac{d1}{v1}+ \frac{d2}{v2}\\
t= \frac{d}{2*v1}+ \frac{d}{2*v2} \\
t= \frac{d*v2+d*v1}{2*v1*v2} \\
t= \frac{d*(v1+v2)}{2*v1*v2}\\
vm= \frac{2*d*v1*v2}{d*(v1+v2)}\\
vm= \frac{2*v1*v2}{v1+v2} \\
Calcule:\\
vm= \frac{2*50*70}{50+70}= 58,(3) \frac{km}{h} [/tex]
