Question

A book is sliding along a desk top. Because the book is in motion ,you know that the forces acting on the book are A. Balanced B. Unbalanced C. In One Direction only D. Pushing upward and downward only

Answer 1

Just because the book is moving doesn't tell you anything about the forces on it, or even whether there ARE any.

Just look at Newton's first law of motion, and this time, let's try and THINK about it too. It says something to the effect that any object continues in constant, uniform MOTION ..... UNLESS acted on by an external force.