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以自由落體為例: 假設質量為m的物體從高為h的地方自由下落,加速度為g,所用時間為t,落地瞬間的速度為v. 則根據運動相關知識: h=g*t^2/2. 兩邊同時乘以mg.得: mgh=mg^2*t^2/2. 又 gt=v. 代入上式得: mgh=mv^2/2. 這就是自由落體中的機械能守恆定律.
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