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s. Shown is the graph of a force function (in newtons) that increases to its maximum value and then remains constant. How much work is done by the force in moving an object a 14. A thick cal distance of & m? winch on done if the FANE (a) Follo (by Write after the 10 of d 15: A cable 2 3 5 6 7 8 x (m) mine s 16. A chai 6. The table shows values of a force function f(x), where x is 80 kg measured in meters and f(x) in newtons. Use the Midpoint cham Rule to estimate the work done by the force in moving an 17. A lea object from x - 4 to x = 20. 12 m Initia 6 8 10 12 14 16 18 20 leak 5.8 7.0 8.8 9.6 8.2 buck f(x) 5 6.7 5.2 4.1 18. Ab use 7. A force of 10 lb is required to hold a spring stretched 4 in. is f beyond its natural length. How much work is done in stretch- bu ing it from its natural length to 6 in. beyond its natural length? Fi 8. A spring has a natural length of 40 cm. If a 60-N force is 19. A required to keep the spring compressed 10 cm, how much work is done during this compression? How much work is required to compress the spring to a length of 25 cm? 20. 9. Suppose that 2 J of work is needed to stretch a spring from its natural length of 30 cm to a length of 42 cm. (a) How much work is needed to stretch the spring from 35 cm to 40 cm? 21. (b) How far beyond its natural length will a force of 30 N keep the spring stretched? 10. If the work to stretch a spring I ft beyond its natural