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
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
- 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}}}} $
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