A 2.00 kg block situated on a rough incline is connected to a spring of negligible mass?

Question

A 2.00 kg block situated on a rough incline is connected to a spring of negligible mass having a spring constant of 100 N/m (Fig. P5.76). The block is released from rest when the spring is unstretched, and the pulley is frictionless. The block moves 21.2 cm down the incline before coming to rest. Find the coefficient of kinetic friction between the block and incline.

link: http://www.webassign.net/sf/p5_76.gif

help pleasee

Answer 1

Force equation

Fd+ f - Fs=F
Fd= Wsin(37)=mg sin(37)
f=uN= u mg cos(37)=
Fs= kx
F=ma=0 (it's not moving is it?)

mg sin(37) + u mg cos(37) - kx=0
u=(kx-mg sin(37)) / mg cos(37)
and this this static not kinetic coefficient of friction.