A distant large asteroid is detected that might pose a threat to Earth. If it were to continue moving in a straight line at constant speed, it would pass 22000 km from the center of Earth. However, it will be attracted to Earth and might hit our planet

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 ∞.

That depends on what kind of environ meant it is in  in space it has the same force that was applied when the velocity was gained

The answer is periosteum