Aducem toate marimile in unitatile din SI
[tex]v_1=12 km/h=3,33 m/s\\v_2=24 km/h=6,66 m/s\\v_3=48 km/h=13,33 m/s\\t_1=2 min=120 s\\t_2=6 min=360 s\\t_3=2 min=120 s\\[/tex]
Acum,folosim formula d=v*t pentru a afla distanta parcursa in fiecare interval de timp
[tex]d_1=v_1*t_1=3,33*120=400 m\\d_2=v_2*t_2=6,66*360=2400 m\\d_3=v_3*t_3=13,33*120=1600 m\\[/tex]
Pentru a afla distanta totala facem suma celor trei distante obtinute
[tex]d=d_1+d_2+d_3=400+2400+1600=4400 m[/tex]
Timpul total de miscare este [tex]t=t_1+t_2+t_3=120+360+120=600 s[/tex]
folosim formula d=v*t si scoatem viteza ,astfel obtinem viteza medie,unde d=4400 m si t=600 s
[tex]d=v_m*t=>v_m=\frac{d}{t}=\frac{4400}{600}= 7,33 m/s=26,4 km/h=>v_m=26,4 km/h[/tex]
