How Does a Ship's Angle and Friction Affect Its Acceleration Down a Ramp?

[HaZzArD 09]

A ship is launched into the water down a ramp making an angle of 8 degrees with the horizontal. The Coefficient of kinetic friction between the boat and the ramp is Mk = 0.06. What is the acceleration?

 

[diazona]

What have you tried?

 

[HaZzArD 09]

I'm not sure which formula to use.
There's f=mg sin0=MsN
N=mg cos0
Fx=max=Fgx +f
max= mg sin0 - Mmg cos0
Mk=Fkx/N