Question : A cat moves from π to π with a uniform speed π£π’and returns to X with a uniform speed π£π. The average speed for this ground trip is
(A) -\dfrac{2v_{d}v_{v}}{v_{d}+v_{u}}
(B) \sqrt{V_{u}V_{d}}
(C) \dfrac{v_{d}v_{u}}{v_{d}+v_{u}}
(D) \dfrac{v_{u}+v_{a}}{2}
Answer : option (A)
Solution :
