NEET 2023, Physics Q20: Motion In One Dimension

NEET2023Physics

A vehicle travels half the distance with speed $v$ and the remaining distance with speed $2 v$ . Its average speed is:

Solution

For equal distances at two different speeds, the average is the harmonic mean:

$v_{a v g} = \frac{2 v _{1} v _{2}}{v _{1} + v _{2}} = \frac{2 \cdot v \cdot 2 v}{v + 2 v} = \frac{4 v ^{2}}{3 v} = \frac{4 v}{3}$ .

Concept behind this question

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