1. The problem statement, all variables and given/known data A spring can be compressed 12 cm by an applied force of 6.0 N. A 2.8 kg box sliding along a frictionless surface approaches this spring at a speed of 1.9 m/s. How far will the spring be compressed when the box comes to a stop? 2. Relevant equations Ep = 0.5kx2 0.5mv2 = 0.5kx2 3. The attempt at a solution I worked out that k = 50 N/m 0.5mv2 = 0.5kx2 0= 25x2 but this doesn't work out because x should be 0.45 m. help?