Solve for friction coefficient of block on sp

[tensor0910]

1. Homework Statement

A block of mass 1.60 kg is connected to a spring of spring constant 152 N/m which is then set into oscillation on a surface with a small coefficient of kinetic friction. The mass is pulled back 34.6 cm to the right and released. On the first right to left oscillation, the mass reaches 33.22 cm to the left

What is the coefficient of friction?2. Homework Equations
3. The Attempt at a Solution :

Pretty lost on this one. With 2 different distances, and a spring constant my first instinct was to use the total energy, and solve for V ( F_sp = 1/2k( x_f - x_i )

After that I am not sure...

 

[gneill]

Write out your Relevant equations for springs. Write out your relevant equations for friction and work.

Why do you suppose the spring's motion to the left is less than its initial stretch to the right? What changed? By how much?