如果球在A点有初速度，R会落在（1，2】内，而且当初速v=∞时，R=2。无初速时，R落在（0，1】。

来源: askerfor 于 2021-06-22 07:06:37 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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