I push a book, and according to the third law of motion, the book also pushes me in the opposite direction, then how does the book move?
Answer: I pushed a book. That is, the force I applied to the book is action force. The book will also exert an equal reaction force on my hand in the opposite direction according to Newton’s third law of motion. Since the force acts on two different objects, there is no question of their cancelling each other. So the book will move for the action force.