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NEET 2011 (AIPMT, Mains) · Distance, Displacement & Average Speed

Distance, Displacement & Average Speed question from NEET 2011 (AIPMT, Mains)

Q18NEET 2011 · AIPMT · MAINSEasy

Distance, Displacement & Average Speed

A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is

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Answer: (c)

Let each half be $d$ . Total time $t = \frac{d}{v_1} + \frac{d}{v_2} = \frac{d(v_1 + v_2)}{v_1 v_2}$ .
$v_{avg} = \frac{2d}{t} = \frac{2v_1 v_2}{v_1 + v_2}$
So the answer is (c).

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