小勇用如图所示的滑轮组拉着物体匀速前进了0.2m,则绳子自由端移动的距离为______m.若物体与地面的摩擦力为9N,则他所作的有用功是_______J,如果小勇对绳的拉力是F=4N,该滑轮组的机械效率为____
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![小勇用如图所示的滑轮组拉着物体匀速前进了0.2m,则绳子自由端移动的距离为______m.若物体与地面的摩擦力为9N,则他所作的有用功是_______J,如果小勇对绳的拉力是F=4N,该滑轮组的机械效率为____](/uploads/image/z/12566446-70-6.jpg?t=%E5%B0%8F%E5%8B%87%E7%94%A8%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E6%BB%91%E8%BD%AE%E7%BB%84%E6%8B%89%E7%9D%80%E7%89%A9%E4%BD%93%E5%8C%80%E9%80%9F%E5%89%8D%E8%BF%9B%E4%BA%860.2m%2C%E5%88%99%E7%BB%B3%E5%AD%90%E8%87%AA%E7%94%B1%E7%AB%AF%E7%A7%BB%E5%8A%A8%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA______m.%E8%8B%A5%E7%89%A9%E4%BD%93%E4%B8%8E%E5%9C%B0%E9%9D%A2%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%E4%B8%BA9N%2C%E5%88%99%E4%BB%96%E6%89%80%E4%BD%9C%E7%9A%84%E6%9C%89%E7%94%A8%E5%8A%9F%E6%98%AF_______J%2C%E5%A6%82%E6%9E%9C%E5%B0%8F%E5%8B%87%E5%AF%B9%E7%BB%B3%E7%9A%84%E6%8B%89%E5%8A%9B%E6%98%AFF%3D4N%2C%E8%AF%A5%E6%BB%91%E8%BD%AE%E7%BB%84%E7%9A%84%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87%E4%B8%BA____)
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