Oblicz średnią wartość prędkości. Droga s1=10km, s2=15km, t1=30min, t2=0,5h

[latex]dane:\s_1 = 10 km\t_1 = 30 min = 0,5 h\s_2 = 15 km\t_2 = 0,5 h\szukane:\v_{sr = ?[/latex] [latex]v_{sr} = frac{s_{c}}{t_{c}}\\s_{c} = 10km+15km = 25 km\t_{c} = 0,5h+0,5h = 1 h\\v_{sr} = frac{25km}{1h} = 25frac{km}{h}[/latex]