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碰撞是力学的重点之一,有些涉及碰撞过程的习题难度较大。如下两道题中所设置的条件基本相同,但有关书刊中所给出的答案却不同。因此有予以讨论的必要。
Collision is one of the focuses of mechanics, and some problems involving the collision process are more difficult. The conditions set in the following two questions are basically the same, but the answers given in the relevant books are different. Therefore there is a need for discussion.