That calculation doesnt factor in object velocity or change in shape with an object like a football that is not solid and has a very low mass compared to its surface area.
It also doesnt account for aerodynamic spin or wind.
All that equation means is that there is a force that is constatly acting upon the body. That force is over comeable (this is why we have space shuttles etc) but given the power and speed that a modern football can be hit with and achieve it will over come the initial pull and only when it loses enegry will it feel the full force of gravity.
If this were not true then we could only need the goals to e about a foot and a half high and I would only shoot from at most about 3ft.............
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