难题将质量m=2kg的一块石头从离地面H=2m高处由静止开始释放,落入泥潭并陷入泥中h=5cm深处,不计空气阻力,求泥对石头的平均阻力.(g取10m/s2)为什么可以用mgH=1/2mv2=0,mgh-f(平均阻力)h=0-1/2mv2或用
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![难题将质量m=2kg的一块石头从离地面H=2m高处由静止开始释放,落入泥潭并陷入泥中h=5cm深处,不计空气阻力,求泥对石头的平均阻力.(g取10m/s2)为什么可以用mgH=1/2mv2=0,mgh-f(平均阻力)h=0-1/2mv2或用](/uploads/image/z/3824025-33-5.jpg?t=%E9%9A%BE%E9%A2%98%E5%B0%86%E8%B4%A8%E9%87%8Fm%3D2kg%E7%9A%84%E4%B8%80%E5%9D%97%E7%9F%B3%E5%A4%B4%E4%BB%8E%E7%A6%BB%E5%9C%B0%E9%9D%A2H%3D2m%E9%AB%98%E5%A4%84%E7%94%B1%E9%9D%99%E6%AD%A2%E5%BC%80%E5%A7%8B%E9%87%8A%E6%94%BE%2C%E8%90%BD%E5%85%A5%E6%B3%A5%E6%BD%AD%E5%B9%B6%E9%99%B7%E5%85%A5%E6%B3%A5%E4%B8%ADh%3D5cm%E6%B7%B1%E5%A4%84%2C%E4%B8%8D%E8%AE%A1%E7%A9%BA%E6%B0%94%E9%98%BB%E5%8A%9B%2C%E6%B1%82%E6%B3%A5%E5%AF%B9%E7%9F%B3%E5%A4%B4%E7%9A%84%E5%B9%B3%E5%9D%87%E9%98%BB%E5%8A%9B.%EF%BC%88g%E5%8F%9610m%2Fs2%EF%BC%89%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8F%AF%E4%BB%A5%E7%94%A8mgH%3D1%2F2mv2%3D0%2Cmgh-f%28%E5%B9%B3%E5%9D%87%E9%98%BB%E5%8A%9B%29h%3D0-1%2F2mv2%E6%88%96%E7%94%A8)
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