Your friend wants to borrow your math textbook, but she is 4.0 meters away on other end of a long table. You skillfully slide it across the table, it stops exactly in
front of your friend. If the friction force during the slide was 8.0 Newtons, which
below best describes the work done on the book by the friction force? *
W = 2.0 Joules
W = 32 Joules
W = -32 Joules
W = -2.0 Joules