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NEET 2007 (AIPMT) · Distance, Displacement & Average Speed

Distance, Displacement & Average Speed question from NEET 2007 (AIPMT)

Q19NEET 2007 · AIPMTEasy

Distance, Displacement & Average Speed

A car moves from X to Y with a uniform speed vu and returns to X with a uniform speed vd. The average speed for this round trip is

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Answer: (d)

XY and YX are equal distances $d$ , so total distance $= 2d$ .
Total time $= \frac{d}{v_u} + \frac{d}{v_d}$
$v_{avg} = \frac{2d}{d/v_u + d/v_d} = \frac{2v_u v_d}{v_u + v_d}$
So the answer is (d).

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