1. The problem statement, all variables and given/known data A 205 g cube slides down a ramp starting from rest as shown in the figure below. The ramp has a 46° slope. After falling a distance of 92 cm, the cube strikes a spring of spring constant k = 21 N/m. Find the maximum compression of the spring when the coefficient of kinetic friction between the cube and the ramp is 0.13. http://puu.sh/bTjhN/ed172bac4f.png [Broken] 2. Relevant equations conservation of energy laws f=ma 3. The attempt at a solution I solved for work of friction, the work of gravity and the work of spring (d is vertical distance of 92cm and x is the distance of compression) http://puu.sh/bTjoU/221afafc3f.png [Broken] I then used the conservation of energy law to piece together my 3 equations http://puu.sh/bTjw6/e9c0236b16.png [Broken] apparently my equation didn't match with the answer's. Can someone please tell me why?? and what did I miss??