A General Formula for One-Dimensional Collisions

This article presents a new deriving method of a simple formula for all kinds of one-dimensional collision. The formula and the method are easy to be learned and remembered for students than traditional equations for one-dimensional collision. The article presents five different ways to deal with the same question, and suggests that teaching students different ways to deal with the same question is better than one. So it is useful for both of teachers teaching and students learning.