Solving Friction Problem: 3.15 kg Block & 87.4 N Force

[BMWPower06]

Homework Statement

A 3.15 kg block is pushed along the ceiling with a constant applied force of F = 87.4 N that acts at an angle of alpha = 58.9° with the horizontal, as seen in the figure below.
http://aycu26.webshots.com/image/18345/2003241655315981977_rs.jpg
The block accelerates to the right at 5.49 m/s2. Determine the coefficient of kinetic friction between block and ceiling.

Homework Equations

Ff=uN

The Attempt at a Solution

Tried using the angle but don't know what to do.
Any ideas?

 

[hage567]

So what did you use for N? You need to show more of what you did. Have you drawn a diagram with all of the forces on it? Remember Newton's second law.