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5. How long would it take a 200 W motor to do 5000 J of work? 6. If a 55 kg box slides down a 2m high incline, what will be the gravitational potential energy that box will gain at the top of the incline? 7. What is happening as a sky diver is being taken in a plane higher above the Earth? 8. If a spring is stretched from 1 m to 3 m with a force of 13 N, what is the spring constant of the spring? 9. If a spring has a constant of 50 Newton-meters and is stretched with a force of 13 N, how far was it stretched