1. The problem statement, all variables and given/known data How far will a football travel when it is thrown at 62 km/h at an angle of 35° to the ground? 2. Relevant equations V1v = v1 sinθ; Δd= V1v * Δt + 1/2 * (-9.8 m/s^2) * Δt^2; 3. The attempt at a solution V1v = v1 sinθ V1v = 17.2 m/s sin35° [up] =9.9 m/s [up] Δd= = V1v * Δt + 1/2 * (-9.8 m/s^2) * Δt^2 (Factor out Δt) = Δt (9.9 m/s - 4.9 m/s^2 *Δt) Δt = 0 or 2.0s I do correspondence schoolwork and this question is just a support question and I won't be marked on it. The thing is I still need to know how to do the question (obviously). Here is where I run into my problem: I know how to figure everything out, EXCEPT for how they managed to get Δt = 0 or 2.0s. I don't know how to figure out the time. Any help would be appreciated. And please dumb it down as much as possible - physics is not my strongest subject.