如图所示轻弹簧下端固定在水平面上.一个小球从弹簧正上方某一高度处由静止开始自由下落把弹簧压缩到一定程度再反�弹回.从小球接触弹簧到到达最低 Template




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tomski如图所示轻弹簧下端固定在水平面上.一个小球从弹簧正上方某一高度处由静止开始自由下落把弹簧压缩到一定程度再反�弹回.从小球接触弹簧到到达最低 coloring