1. Which combination of units can be used to express work? (1) newton · second/meter (2) newton • meter/second (3) newton/meter (4) newton· meter 2. A jack exerts a vertical force of 4.5 × 10³ newtons to raise a car 0.25 meter. How much work is done by the jack? (1) 5.6 x 10-5J (2) 1.1 x 103J (3) 4.5 × 103 J (4) 1.8 x 104J 3. If a 2.0-kilogram mass is raised 0.050 meter vertically, the work done on the mass is approximately (1) 0.10 J (2) 0.98 J (3) 9.8 J (4) 40. J 4. A total of 640 joules of work is done on a 50.-kilogram object as it is moved 8.0 meters across a level floor by the application of a horizontal force. Determine the magnitude of the horizontal force applied to the object.

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