如图1 4所示斜面长为l倾角为θ物体质量为m与斜面的动�擦因数为μ用一沿斜面的恒力f将物体由底端匀速推到顶端则力f做的功为 重力 Template




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tomski如图1 4所示斜面长为l倾角为θ物体质量为m与斜面的动�擦因数为μ用一沿斜面的恒力f将物体由底端匀速推到顶端则力f做的功为 重力 coloring