人教版高中《物理》必修2第5章曲线运动这节以试管中蜡块的运动为例,阐述了合运动和分运动的概念.而课外习题常以小船过河为题材,对运动的合成和分解进行考察.笔者这里要探讨的是乘小船过河后,人登岸再跑步前进这类情形的最值问题. People’s PEP High School “Physics” Compulsory 2 Chapter 5 Curvilinear Movement This section takes the movement of wax blocks in a test tube as an example to illustrate the concept of co-movement and sub-movement, while extracurricular exercises often take the boat across the river as a theme, Synthesis and decomposition to investigate the author here is to explore is the most value-added issue of such cases after the boat crossed the river, the man went ashore and then run forward.