Question 557924: Where does the -16 come from in the vertical motion equation?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! Where does the -16 come from in the vertical motion equation?
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Earth's gravitational acceleration is apx 32.16 ft/sec/sec, 32 is often used.
16 is 1/2 of that, in the equation s = at^2/2 = 16t^2
It's negative because it's downward.
--> -16t^2
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