al length to a Tungui UI 6 m. ruyom direction is e work done O to x = 5. 7. A spring exerts a force of 100 N when it is stretched 0.2 m beyond its natural length. How much work is required to stretch the spring 0.8 m beyond its natural length? 8. A spring whose natural length is 15 cm exerts a force of 45 N when stretched to a length of 20 cm. (a) Find the spring constant (in newtons/meter). (b) Find the work that is done in stretching the spring 3 cm beyond its natural length. (c) Find the work done in stretching the spring from a length of 20 cm to a length of 25 cm. 9. Assume that 10 ft-lb of work is required to stretch a spring 1 ft beyond its natural length. What is the spring constant? onsider the orce on the 0 to x d 10-13 True-False Determine whether the statement is true or %3D oves from false. Explain your answer.

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