如图所示在光�的水平桌面上有一物体a通过绳子与物体b相连假设绳子的质量以及绳子与定�轮之间的�擦力都可以忽略不计绳子不可伸长.如果mb Template




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tomski如图所示在光�的水平桌面上有一物体a通过绳子与物体b相连假设绳子的质量以及绳子与定�轮之间的�擦力都可以忽略不计绳子不可伸长.如果mb coloring