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Hmmm...I may be really late, but these questions always bug me. I get something different from you Artsemis for #1. My reasoning is as follows :
if W = integral(f*dx) and f = -k*x, the W = int[-k*x*dx]. If you integrate that from 0 -> 6, you get W = -k*x^2/2, and apply limits of integration and all that, and you can back out k. Integrating the second one gives you something different from 216 for the W for a foot...but I'm curious about the answer when you get it back. Good luck.
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