如图所示的滑轮组中，用F=3N的力拉着重为20N的木块以0.2m/s的速度匀速前进了0.4m，不计滑轮重及滑轮与绳之间的摩擦，则拉力所做的功是_1J，功率是_2W。_刷题宝

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如图所示的滑轮组中，用F=3N的力拉着重为20N的木块以0.2m/s的速度匀速前进了0.4m，不计滑轮重及滑轮与绳之间的摩擦，则拉力所做的功是____J，功率是____W。

上一题下一题 0.0难度选择题更新时间:2017-04-28 03:35:36

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3.6,1.8

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