When is g taken to be positive and when is it negative ( upward and downward motion)
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since we're going up, and the gravity's down, g is negative. when we come down in the same direction as that of g-force, g is positive
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Explanation:
It doesn't really matter.
If you take g as positive because the velocity is along g, just take all the vectors facing down as positive and all facing up as negative.
If you take g as negative because g is in the "downward direction" just take all the vectors facing up as positive and all facing down as negative.
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