A 1.50 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.21 m/s, and at point B it has slowed to 1.25 m/s. (a) How much work was done on the book between A and B? (b) If -0.75J of work is done on the book from B to C, how fast is it moving at point C? (c) How fast would it be moving at C if +0.75J of work were done on it from B to C?