A test question that has been bugging me all day.(cant figure it out)

[HappMatt]

well i had a test today and one of the questions was this.

:A particle particle mass of 25g rolls up and inclined palne of 20 degree with a Velocity intial of 3.0m/s, there is a frictional force of .4 and at point x2 the velocity is 1.0m/s

What is the acceleration due to friction?

I have been thinking about this since 3 and had to work but i was on my mind the whoe time. I've tried useing K1+U1-Wother=K2+U2
if you can lead me as to where to go with this it would be appreciated.

 

[durt]

Is that the frictional force in Newtons or the coefficient of friction?

 

[HappMatt]

that would be the coeff of Fkinetic