( 1. )Two horizontal forces act on a wagon, 550-N forward and 300-N backward. What additional force is needed to make the net force be zero? 2. A 1-kg ball is thrown straight up in the air. What is the net force acting on the ball when it reaches its maximum height? 3. A 1-kg ball is thrown straight up in the air. What is the ball's acceleration when it reaches maximum height? 4. If you stand on a spring scale in your bathroom at home, it reads 600-N, which means your mass is 61.2 kg. If instead you stand on the scale while accelerating at 2 m/s upward in an elevator, how many newtons would it read? 5. A mother of mass 50 kg and her daughter of mass 25 kg are ice-skating. They face each other, and the mother pushes on the daughter such that the daughter's acceleration is 2 m/s2. What is the force exerted by the mother on the daughter? 6. A mother of mass 50 kg and her daughter of mass 25 kg are ice-skating. They face each other, and the mother pushes on the daughter such that the daughter's acceleration is 2 m/s2. What is the force exerted by the daughter on the mother? 7. A mother of mass 50 kg and her daughter of mass 25 kg are ice-skating. They face each other, and the mother pushes on the daughter such that the daughter's acceleration is 2 m/s2. What is the mother's acceleration? 8. A 90.0-kg person has a gravitational force of 150.0-N on the Moon. What would the free-fall acceleration on the Moon be? 9. A model train undergoes an acceleration of 0.4 m/s when a net force of 3.2-N is applied to it. What is the mass of the train? 10. An ice skater with a mass of 60.0-kg moves with a constant speed of 8.0 m/s in a straight line. How long will it take a force of 120.0-N to stop the skater if the force opposes the motion? 11. A 300.0-N crate drops straight down from a helicopter into a large snowdrift. The crate slows as it crashes through the snow. Is the upward force exerted by the snow on the crate greater than, equal to, or less than 300.0- N? 12. A 300.0-N crate drops straight down from a helicopter into a large snowdrift. The crate slows as it crashes through the snow. What is the direction of the crate's acceleration while it is being slowed by the snow? 13. A 2000.0 kg car accelerates uniformly from rest to 30.0 m/s in a time of 20.0 s. What is the net force acting on the car? 14. A man with a mass of 85.0 kg is riding in an elevator that is accelerating upward at 1.2 m/s2. How much force does the floor of the elevator exert on him? 15. A woman with a mass of 70.0 kg is riding in an elevator that is accelerating downward at 0.8 m/s2. How much force does the floor of the elevator exert on her