题目内容

分子间有相互作用势能，规定两分子相距无穷远时两分子间的势能为零，设分子a固定不动，分子b以某一初速度从无穷远处向a运动，直到它们之间的距离最小。在此过程中，ab之间的势能()。

A. 先减小，后增大，最后小于零
B. 先减小，后增大，最后大于零
C. 先增大，后减小，最后小于零
D. 先增大，后减小，最后大于零

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