題目是這樣的
有一艘1000kg的船 以90km/hr的速度在水上滑行
且他的引擎已關掉
船與水面的的摩擦力f量值為f=70v(v為船速)
而f的單位是牛頓 v的單位是m/s
試問船從90km/hr減速到45km/hr所需時間若干?
請高手為小弟解答 感激不盡
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