如图所示用�轮组拉着重600n的物体a沿水平方�匀速移动在40s要内物体移动了8m拉力f做的功为1280j求1求拉力f的大小和 Template




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tomski如图所示用�轮组拉着重600n的物体a沿水平方�匀速移动在40s要内物体移动了8m拉力f做的功为1280j求1求拉力f的大小和 coloring