Simon S. answered • 01/21/16
Tutor
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Purveyor of Analytical Toys
Sounds like a projectile motion question. To answer these, you need to set up a system of two kinematic equations -- one for the horizontal direction and one for the vertical direction. One of these two equations will contain the unknown quantity you're looking for and a second unknown quantity; you can use the other equation to solve for this second unknown quantity.
I invite you to reread the problem and think critically about which of the following quantities you know: Δx, Δy, vix, viy, vfx, vfy, ax, ay, Δt. By my count, the problem gives you three of them, and you can figure out the ax and ay because they're the same for every projectile motion problem. From there, I recommend seeing if you can use one of the kinematic equations to find Δt; once you know Δt, you should be able to find the answer.
I invite you to reread the problem and think critically about which of the following quantities you know: Δx, Δy, vix, viy, vfx, vfy, ax, ay, Δt. By my count, the problem gives you three of them, and you can figure out the ax and ay because they're the same for every projectile motion problem. From there, I recommend seeing if you can use one of the kinematic equations to find Δt; once you know Δt, you should be able to find the answer.
