Aball initially at rest rolls down a hill and has an acceleration of 3.3 m/s2. if it accelerates for 7.5 s, how far will it move during this time?

(-9.8gravity)^2-(3.3)^2=b=9.22
v=9.22(7.5s)=69.525
x=vi*T
=521.43

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 ∞.