A 1.3-kg book rests on a table. A downward force of 15 N is exerted on the top of the book by a hand pushing down on the book
What is the net force on the book?

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?