如图所示用恒力f拉一个质量为m 的物体由静止开始在水平地面沿直线运动的位移为s力f与物体运动方�的夹角为α已知物体与地面的动�擦因数为 Template




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tomski如图所示用恒力f拉一个质量为m 的物体由静止开始在水平地面沿直线运动的位移为s力f与物体运动方�的夹角为α已知物体与地面的动�擦因数为 coloring