在水平面上一轻质弹簧竖直放置在它正上方一物体自由落下如图所示在物体压缩弹簧速度减为零的过程中 A.物体的动能不断减小b.物体所受的 Template




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tomski在水平面上一轻质弹簧竖直放置在它正上方一物体自由落下如图所示在物体压缩弹簧速度减为零的过程中 a.物体的动能不断减小b.物体所受的 coloring