1. The problem statement, all variables and given/known data If a mass (.5 lb) is pushed down a ramp at a constant unknown force into a spring, compressing it 3 inches, what is the spring constant? 2. Relevant equations Mass: .5lb Time: 3 seconds Length of ramp: 28 inches inital height of ramp: 5.5 inches final height: 0 µ: .52 The ramp angle is 15o to the ground 3. The attempt at a solution I understand that if I set the equation up like this: 1/2mv2o + mgho + 1/2Kx2o + Wnc = 1/2mv2 + mgh + 1/2Kx2 And plug in what I know, I will find the answer for the spring constant, But I'm having trouble finding the work of the non conservative forces. and the final and initial velocities. I just need help figuring them out so I can solve for K. Thank you to anyone who helps :) I really appreciate it!