The force F required to compress a spring a distance x is given by F 2 F0 5 kx where k is the spring constant and F0 is the preload. Determine the work required to compress a spring whose spring constant is k 5 200 lbf/in a distance of one inch starting from its free length where F0 5 0 lbf. Express your answer in both lbf·ft and Btu.

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FIGURE P2-29E