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英语翻译calculate the magnitude of the resultant of a pair of 10

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英语翻译
calculate the magnitude of the resultant of a pair of 100km/h velocity vectors that are at right angles to each other.
calculate the speed of raindrops hitting your face when they fall vertically at3m/s while running horizontally at 4m/s.
Christopher can paddle a canoe in still water at 8km/h.How successful will he be at canoeing upstream in a river that flows at 8km/h?
两个100km/h的速度矢量互为直角,计算他们的和
当你以4m/s的速度水平奔跑时,计算以3m/s速度垂直下落的雨滴打在你脸上的速度
克里斯托弗可以在静止的水中以8km/h的速度划行独木舟,他怎样才能成功地在流速为8km/h的河流里向上游划行?