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單元二 力與運動 · 單元2: 力與運動 - 59 - 2-1 牛頓第一運動定律 ※ 牛頓運動定律 The Laws of Newton 1642-1727 第一運動定律:任何物體,若是不受外力作用,或是受外力作用但是合力=0時
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