| m1g |
| k1 |
处于拉伸状态时的拉伸量为：x2＝
| m2g |
| k1 |
开始平衡时，劲度系数为k2的轻弹簧处于压缩状态，压缩量为：x3＝
| m1g+m2g |
| k2 |
物块2重力势能增加了：m2gx3＝m2g×
| m1g+m2g |
| k2 |
| (m1+m2) |
| k2 |
物块1重力势能的增加量为：m1g(x1+x2+x3)＝m1(m1+m2)g2(
| 1 |
| k1 |
| 1 |
| k2 |
故答案为：m2g2
| (m1+m2) |
| k2 |
| 1 |
| k1 |
| 1 |
| k2 |
| m1g |
| k1 |
| m2g |
| k1 |
| m1g+m2g |
| k2 |
| m1g+m2g |
| k2 |
| (m1+m2) |
| k2 |
| 1 |
| k1 |
| 1 |
| k2 |
| (m1+m2) |
| k2 |
| 1 |
| k1 |
| 1 |
| k2 |