1. The problem statement, all variables and given/known data A 36kg girl slides down a slide that is 4.5m long. At the bottom of slide she is moving at 3 m/sec. If slide is inclined at 35 degrees find the coefficient of friction between slide and girl. 2. Relevant equations Ff = μ*Force normal Total energy = KE + PE KE = 1/2 mv^2 PE = mgh Total energy = F cosθ 3. The attempt at a solution KE = 162 using above formula, PE = 911.15. Total energy = 1073.15 F = 1310.32 using the cosθ formula. And that is where I am stuck - is the F the normal force or the Ff (from friction) how would I solve for the coefficient from this point? And have I even approached it in the right way so far?