某物体放在粗糙的水平面上初速为零第一次用力f推第二次用力f拉如图所示两次角力大小和物体位移都相同那么 A力f对物体做功相等 Template




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tomski某物体放在粗糙的水平面上初速为零第一次用力f推第二次用力f拉如图所示两次角力大小和物体位移都相同那么 a力f对物体做功相等 coloring