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Re: positive and negative work

Jack Uretsky wrote:

But it is important to teach students that "conventions" are
arbitrary. Many people, including physics teachers, seem
not to understand that.

A good place to begin is to show that g=-9.8 when the y axis
is pointing up but g=+9.8 when the y axis is pointing down.
I am referring to kinematics of falling objects.
Ludwik Kowalski