物体从某一高度处自由下落落到直立于地面的轻弹簧上如图7 5 1所示在a点物体开始与弹簧接触到b点物体的速度为零然后被弹回下列说法中 Template




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tomski物体从某一高度处自由下落落到直立于地面的轻弹簧上如图7 5 1所示在a点物体开始与弹簧接触到b点物体的速度为零然后被弹回下列说法中 coloring