We need to find the time where the football reaches the ground, so:
[tex]y=-16x^2+32x=0[/tex][tex]\begin{gathered} solve_{\text{ }}for_{\text{ }}x: \\ -16x(x-2)=0 \\ so: \\ x=0 \\ or \\ x=2 \\ Therefore: \\ \Delta x=2-0=2 \end{gathered}[/tex]
Answer:
2 seconds
