1. The problem statement, all variables and given/known data Two carts 'a' and 'b' are floating on a frictionless air-track and are stationary. 'a' is three times the mass of 'b'. They are being held together and there is a spring between them. The carts are released. Describe what happens after the release. 2. Relevant equations Im guessing the usual Kinetic Energy equations are relevant here 3. The attempt at a solution Well not sure if i am on to something but cart B will definitely go further than cart A as it weighs less and the acceleration of Cart B will be significantly quicker too. But i am confused with the forces acting on them in this situation. It says to describe only but want to know a bit more detail if possible.