A body travels first half distance at speed v₁ and second half at v₂. Average speed is:

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For equal distances: average speed = total distance/total time = 2d/(d/v₁ + d/v₂) = 2v₁v₂/(v₁+v₂). This is harmonic mean, not arithmetic. Memory tip: Equal distances ⇒ harmonic mean of speeds; equal times ⇒ arithmetic mean. Frequently tested kinematics concept distinguishing average speed calculation methods.

A body travels first half distance at speed v₁ and second half at v₂. Average speed is: MCQ with Answer and Explanation

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