Velocity and acceleration

1. The problem statement, all variables and given/known data

An army tank on a mountainside fires its gun horizontally. The shell strikes the ground at a horizontal distance of 6000 m away from the tank. As the vertical component of the shell’s striking velocity is vy=200 m/s, how soon after it is fired does the shell strike the ground? (g=10 m/s2)

2. Relevant equations
v^2=2ax (1)
x=at^2/2 (2)
3. The attempt at a solution
40000=2*a*6000
then find t with (2) but why is it the component vy?

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