7.如图所示质量相同的两物体处于同一高度a沿固定在地面上的光�斜面下�b自由下落最后到达同一水平面则物体到达底端时 A.动能相同 b Template




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tomski7.如图所示质量相同的两物体处于同一高度a沿固定在地面上的光�斜面下�b自由下落最后到达同一水平面则物体到达底端时 a.动能相同 b coloring