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The canonical homework exercise that goes with this bit of physics is as
follows:
Suppose an interstellar spaceship starts from rest, and
accelerates such that the passengers feel one Gee (980 gal)
for one year. How fast are they going at the end of the year?
Huge hint: V=tanh(rho) where rho is called the "rapidity". Find rho.
The answer is cute and worth remembering.