1. The problem statement, all variables and given/known data A 2 kg mass and a 3 kg mass are on a horizontal frictionless surface, connected by a massless spring with spring constant k = 140 N/m. A 15 N force is applied to the larger mass. How much does the spring stretch from its equilibrium length? The masses uniformly accelerate with no oscillations. 2. Relevant equations Fspring = -kx (Hooke's law) 3. The attempt at a solution I haven't the slightest clue how to figure the 2 kg mass in. I know I'm solving for x, but like I mentioned, I don't know what to do with the 2 kg mass. Thanks for any help.