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Bob Sciamanda wrote in reply:
If I'm not mistaken, there is a minus sign error,
I get for (1dim motion along x axis, F=-k(x-xo);
This is only true if the spring is relaxed at x = xo; ie; xo is not
arbitrary.
Absolutely! I had hoped that went without saying, but
probably should have
stated it. As many have noted, one should probably not make
such unwarranted
assumptions on Phys-L :-)