Calculate the energy lost to friction

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1. Homework Statement

http://i43.tinypic.com/i1bq1i.jpg
I need help with number 9

2. Homework Equations

Wnet=change in KE
Wnc=Change in Energy

The Attempt at a Solution

so I'm assuming the energy dissipated means the work done by friction?
so work of friction is umgcos(15)*d
d=cos(15)h
I got that work of friction is -9.8257
Help?

 

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nvm I figured it out.
.2*mgcos15*d
and the d=h/sin15