Loss of mechanical energy due to friction - ?? 1. The problem statement, all variables and given/known data Here, ill post the problem as a picture below, so you have all the info. 2. Relevant equations 3. 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 ?