Finding distance with velocity, Uk

[habs.fan]

Homework Statement

An airplane makes a belly landing at 80km/h (I've converted to 22.22222m/s), the coefficient of kinetic friction between it and the runway is 0.60. How far does the airplane slide on the runway?

Homework Equations

acceleration = [sine(x) - (Uk)(cos(x))] x gravity (I used this formula for an incline question)
V2^{}2 = V1^{}2 + 2ad

The Attempt at a Solution

I've tried using the acceleration = sinex ... formula to solve for the acceleration of the airplane, using an angle of 0 because this is the formula I used for an incline question. I found the acceleration was -5.88m/s/s, then plugged that into the second formula, which yielded me a distance of 1.9m that the airplane travels...which doesn't really make sense to me:
0 = 22.2 + 2(-5.88)(d)
d = 1.9m
Have I done something wrong, or is there an easier formula to use that I haven't come across in my class?

 

[pooface]

You didn't square the initial velocity.

 

[habs.fan]

oh my...thanks