Question

An athlete takes a lap of a track with a speed v. At what speed must he cover the second lap, so that his average speed for the 2 laps is 2v?


(A) v (B) 2v (C) 3v (D) 1.5 v (E) None of these

Answer 1

Answer:

Option (B) 2v

Explanation:

To make the average speed of the complete motion equal to 2v, his second lap velocity around the circular track must be 3v. It must follow the formula Avg speed = (v1 + v2) / 2. Using such formula, Avg speed = (v + 3v) / 2 = 4v/2 = 2v.

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Answer 2

Answer:

Step-by-step explanation:in that case the answer will be option C ie 3v