I though you might like a light break to solve a problem probably more interesting than the author intended. This is from Physics, Classical and Modern, by Gettys, Keller, and Skove, 1989 (first?) edition. Question 10-1, page 220. Estimate the maximum magnitude of momentum you have ever had. In what reference frame? This is a text for a 2 or 3 semester physics survey course, so the typical reader may be unaware of some reference frames available for answering the question.