Projectile Velocity Calculation with Given Angle and Direction

[proness26]

Homework Statement

An object is launched and it's velocity upon landing is 12 m/s [13 degrees below the horizontal].
If I assume down is positive and up is negative, what would my given for vf look like?

Homework Equations

in the x direction: vfcostheta
in the y direction: vfsintheta

The Attempt at a Solution

vf=-12m/s cos -13

Is it negative 13 b/c it's below the horizontal?

 

[zaddyzad]

Try to draw a diagram first. I don't really understand what your question is.