1. The problem statement, all variables and given/known data A 2.00 kg block situated on a rough incline is connected to a spring of negligible mass having a spring constant of 100 N/m. The block is released from rest when the spring is unstretched, and the pulley is frictionless. The block moves 0.204 m down the incline before coming to rest. Find the coefficient of kinetic friction between the block and incline. http://img692.imageshack.us/img692/9474/physicsam.jpg [Broken] 2. Relevant equations 3. The attempt at a solution Final position is used as 0 height. http://img694.imageshack.us/img694/2420/physicsm.jpg [Broken] The way I see the forces is that Fs and Ffric acts in one direction and Fgsin37 opposes it. Fs+Ffric=Fgsin37 kx+u(mgcos37)=mgsin37 100(0.204)+u((2)(9.8)cos37)=(2)(9.8)sin37 u=-0.55 Coefficient came out negative so this approach wont work. For the most part, I don't understand how to approach this problem. What does it seem like I don't understand?