1. The problem statement, all variables and given/known data A 2kg block & 3kg block (left & right, respectively) are on a horizontal frictionless surface connected by a spring with K=140 N/m. A 15N force is applied to the 3kg block towards the right. How much does the spring stretch from its equilibrium length? 2. Relevant equations F=-kx others, maybe? 3. The attempt at a solution I simply did force over constant, which is 15/140=0.107m. Is it this simple, or do you use the masses in some way? Thank you!