4. A boy with a mass of 65.2kg and maintaining a velocity of 1.1m/s, rides his bike up a hill with an elevation gain of 43 meters. It takes the boy 1.5 minutes to make it up the hill. What was his power output for the hill climb? 5. Another boy, with a weight of 640N travels a total of 1.1km. His brake is rubbing and exerting a force of 24N. How much work does he perform? 6. You must exert a force of 4.5N on a book to slide it across a table. If you do 2.7J of work in the process, how far have you moved the book?