如图所示在光�水平桌面上有一质量为m的小车小车跟绳一端相连绳子另一端通过�轮吊一个质量为m的砖码则当砝码着地的瞬间小车的速度大小为 在 Template




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tomski如图所示在光�水平桌面上有一质量为m的小车小车跟绳一端相连绳子另一端通过�轮吊一个质量为m的砖码则当砝码着地的瞬间小车的速度大小为 在 coloring