巧选参照物妙解追赶相遇问题蒋金山（浙江省兰溪市一中，３２１１００）两物体追赶相遇问题是运动学中的典型问题，学生容易错，也感觉比较难．如果选取适当的参照物，则能化繁为简、化难为易．例１甲、乙两物体相距ｓ，同时同向运动，乙在前面做加速度为ａ１、初速度为零... Cleverly selecting the reference material to solve the problem of the solution to the problem Jiang Jinshan (Lanxi City, Zhejiang Province, China, 321100) Two objects to catch up with the problem is a typical problem in kinematics, students are prone to mistakes, but also feel more difficult. If you select an appropriate reference, you can simplify everything and make it easier. Example 1A and B are two objects apart from each other and move in the same direction. B has acceleration at the front and a first speed of zero.