If all the forces acting on a book are balanced

There is no unbalanced force acting upon the book and thus the book maintains its state of motion.

Explanation:

When all the forces acting upon an object balance each other, the object will be at equilibrium; it will not accelerate. ... Since these two forces are of equal magnitude and in opposite directions, they balance each other.

like poles repel so keep pushing north to north and repels funny to see this

answeralert drivers who drift off the road;