本文拟讨论物理习题中一类能量变化的极值问题。〔例１〕如图１所示，质量为m１的物体A以速度v０沿着光滑水平面向着静止的质量为m２的B物体运动并发生作用，求在作用过程中轻弹簧内的最大弹性势能EPmax。〔解析〕A、B在作用过程中，当两者速度相等时，弹簧压缩形变量最大，弹 This paper discusses the extremum problem of a class of energy changes in physical exercises. [Example 1] As shown in Fig. 1, an object A of mass m1 moves at a velocity v0 along a smooth level toward a stationary mass B of mass m2 and acts to obtain the maximum elastic potential energy in the light spring during the action. EPmax. [Analysis] In the process of A and B, when the two speeds are equal, the deformation of the spring is the largest