Car moving up Inclined Plane question

My question and attempted solution are in the pics below…not sure if what I did was correct though :/

I was thinking that the work done would have been equal to PE+Change in KE + Energy Lost to friction…but not sure how to calculate the energy lost to friction as i’m not sure if it has to be calculated in a specific form eg heat

Attached Images
File Type: jpg IMG_20140309_004331.jpg (108.6 KB)
File Type: jpg IMG_20140309_004223.jpg (119.3 KB)

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