Calculating Horizontal Acceleration

Holy fuck you guys. I was finally able to solve the vertical component of a problem, but the horizontal problem still remains. If the Zeta Gundam is pushed off the Argama (on earth)as it floats .86m above the ground, and travels 1.4m before landing, I can at least calculate the final velocity and time fallen for the y component, and that's great because I can use the time for the x component, but how the FUCK do i find the initial velocity for the x component? I don't have initial or final velocity, or acceleration. Am I supposed to somehow derive horizontal velocity from vertical velocity, or what?

Horizontal acceleration is typically 0, unless he has booster rockets (gundam floating .86m above ground? a typical human > 1.5m tall lol).

Not sure what to say about initial / final horizontal velocity.
How was the question originally worded?

unless he has booster rockets

or maybe drag.