如图所示,一恒力 f 通过一定�轮拉物体沿光�水平面前进了 S ,在运动过程中, 与水平方�保持 θ 角,则拉力 对物体做的功为 Template




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tomski如图所示,一恒力 f 通过一定�轮拉物体沿光�水平面前进了 coloring