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I know we have discussed this before I think, and I read about it in
Aarons..
How do I explain to a student that when we choose up (+y) to be
increasing, we say that the sign of g is negative, regardless of
whether the ball is going up or going down.
My students seem to get that when the object is going up, g is
negative. They want to make the ball going down positive g.
But it stays negative because of the choice of axis.
I am at a loss because until I read Aarons I thought that it
changed signs too...