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Thank you! I should have said that, but didn't. I suspect my
Just to emphasize a piece of Hugh's note.
Never write the kinematics equations with 'g' as I've seen some books do to
create a set of equations for free fall. This is unnecessary and confusing.
If the (constant acceleration) kinematics equations are derived and used,
then they are written in terms of an acceleration 'a'. IF the motion is
free fall, then the vertical acceleration has a magnitude of 9.8 m/s^2 near
the earth's surface with a direction +/- that is totally arbitrary but IS
determined once one makes a sign convention for up and down. 'g' doesn't
appear here--either in the words used and certainly not in the equations.
Keep it that way!