Imagine the extreme example of a wind so strong that it doubles your speed down the home straight. The difference in the time you spend being assisted by the wind versus the time you spend battling it ensures your lap time always slows. When you run down the back straight, however, you spend longer going slower, fighting against the wind. The reason, in essence, is that because you run faster down the home straight, you derive the benefit of being pushed by the wind for only a short time. ![]() ![]() Strangely, however, it doesn’t work out that way. It seems reasonable that these two effects might balance each other out giving Farah the same lap time as if there were no wind at all. When Mo Farah runs with the wind, his speed is increased by a set amount, but when he runs against it on the back straight the wind decreases his speed by the same amount. Consider a wind blowing up the home straight of a standard 400 metre athletics track.
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