question_answer

A person travels along a straight road for the first half time with a velocity \[{{v}_{1}}\] and the next half time with a velocity \[{{v}_{2}}\] . The mean velocity \[V\] of the man is              [RPET 1999; BHU 2002]

A)         \[\frac{2}{V}=\frac{1}{{{v}_{1}}}+\frac{1}{{{v}_{2}}}\]

B)                 \[V=\frac{{{v}_{1}}+{{v}_{2}}}{2}\]

C)         \[V=\sqrt{{{v}_{1}}{{v}_{2}}}\]       

D)       \[V=\sqrt{\frac{{{v}_{1}}}{{{v}_{2}}}}\]