An object moves x distance with speed v1 and next x distance with speed v2. The average velocity v is related to v1 and v2 as
(1) \(V=\left(\frac{V_1+V_2}{2}\right)\)
(2) \(\frac{1}{V}=\frac{1}{V_1}+\frac{1}{V_2}\)
(3) \(V=\left(\frac{2V_1V_2}{V_1+V_2}\right)\)
(4) \(V=\left(\frac{V_1-V_2}{2}\right)\)