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**Loss of mechanical energy due to friction - ??**

## Homework Statement

Here, ill post the problem as a picture below, so you have all the info.

## Homework Equations

## The Attempt at a Solution

I am having trouble with a:

Since I dont have to worry about angles, and that the coeff of friction is not given, this is what I came up with, but I really think its wrong.

(8)(9.8) (1.5) = 117.6 J lost ?