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>For homework, come up with an example along the following lines:
> -- We have an object at the lower end of a long rope.
> -- I move the upper end of the rope.
> -- The result is spectacularly non-conservative.
Suppose a man is pulling a body of mass 'm' vertically up with an
accerleration 'a'.
...
After time 't' the man suddenly stops pulling. The body then rises
through some height and returns to the position at the moment the pull in
the string became zero
(i am not sure about the non-stretchy part)
Let me thank you all for being so encouraging.