2007年普通高等学校招生全国统一考试(广东物理卷)第19题是一道对牛顿第二定律、运动学基本规律、电场力做功、动能定理等物理规律进行综合考查的考题,同时也是考查运用分析、假设、探究、推理等方法处理多过程物理问题的能力综合度极高的好题.题目.如图1所示,沿水平方向放置一 2007 National College Entrance Examination Enrollment (Volume 19) is a physical examination of Newton’s second law, the basic laws of kinematics, electric field work, kinetic energy theorem and other physical laws to conduct a comprehensive examination of test questions, but also test the use of analysis , Assumptions, explorations, reasoning and other methods to deal with multi-process physical problems with high comprehensive ability of the problem. Problem. As shown in Figure 1, along the horizontal direction to place a