1. The problem statement, all variables and given/known data A block of mass 1 kg is forced against a horizontal spring of negligible mass, compressing the spring an amount x1= 0.2m. When released, the block moves on a horizontal tabletop a distance x2 = 1.0m before coming to rest. The spring constant k is 100 N. What is the coefficient of friction, μ, between the block and the table? 2. Relevant equations K1 + U1 = K2 + U2 fs= -kx Kinetic energy = 1/2kv2 Potential energy = mgh 3. The attempt at a solution At x1 kinetic energy is 0 and potential energy is 1/2kΔx2 So the total energy would be = 40. However, I do not know how to tie this in with the coefficients of friction.