A car moves from $X$ to $Y$ with a uniform speed $v_1$ and returns to $Y$ with a uniform speed $v_2$ . The average speed for this round trip is
A car moves from $X$ to $Y$ with a uniform speed $v_1$ and returns to $Y$ with a uniform speed $v_2$ . The average speed for this round trip is
- [AIPMT 2007]
- [NEET 2019]
- A
$\bar v = \frac{{{v_1} + {v_2}}}{2}$
- B
$\bar v =\sqrt {{v_1}{v_2}} $
- C
$\frac{{2}}{{\bar v}} =\frac{1}{{{v_1}}} + \frac{1}{{{v_2}}}$
- D
$\frac{{1}}{{\bar v}} =\frac{1}{{{v_1}}} + \frac{1}{{{v_2}}}$
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