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I'll add my $0.02 worth to what everyone else is saying.
How do I explain to a student that when we choose up (+y) to be incre=
asing, we say that the sign of g is negative, regardless of whether t=
he ball is going up or going down. =20
My students seem to get that when the object is going up, g is negati=
ve. They want to make the ball going down positive g. But it stays =
negative because of the choice of axis. =20
I am at a loss because until I read Aarons I thought that it changed =
signs too...