(adsbygoogle = window.adsbygoogle || []).push({}); 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.

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# Homework Help: Grade 11 Intro to Physics question - distance a football travels

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