Question : A particle covers half of its total distance with speed π£1 and the rest half distance with speed π£2. Its average speed during the complete journey is
(A) \dfrac{v_{1}^{2}v_{2}^{2}}{v_{1}^{2}+v_{2}^{2}}
(B) \dfrac{v_{1}+v_{2}}{2}
(C) \dfrac{v_{1}+v_{2}}{2}
(D) \dfrac{2v_{1}v_{2}}{v_{1}+v_{2}}
Answer : option (D)
Solution :
