In this problem we provide a list of things to ponder concerning the mechanics of particles moving in straight lines.
Think about some which catch your attention. Some might have numerical answers; some might involve simply thinking about the mechanical issues involved. Some might require you to find extra data and others might raise more questions than they answer! They are grouped into three groups of three according to how straightforward we feel that they are to get into. Of course, you may disagree: there
are no hard and fast answers to most of the questions.