如图所示一恒力f通过一动�轮拉物体沿光�水平面前进了s在运动过程中f与水平方�保持θ角则拉力f对物体做的功为 Afscosθb Template




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tomski如图所示一恒力f通过一动�轮拉物体沿光�水平面前进了s在运动过程中f与水平方�保持θ角则拉力f对物体做的功为 afscosθb coloring