小球从某一高度自由落到直立于地面上的轻弹簧上如图所示在a点开始与弹簧接触到b点小球速度为零然后被弹回则 A.小球在b处时加速度为 Template




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tomski小球从某一高度自由落到直立于地面上的轻弹簧上如图所示在a点开始与弹簧接触到b点小球速度为零然后被弹回则 a.小球在b处时加速度为 coloring