this is a good question! i'll do some research and come back when i have the answer!
Answer from: Quest
massxgravity x heght=weightxheight= pe
4900=490xh
h=10
Answer from: Quest
If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.
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