1. The problem statement, all variables and given/known data A 1.1 kg cart and a 2.2 kg cart are at rest with a compressed string between them. the force constant of the spring is 600 N/m. when the spring is released, the carts rapidly separate. how far must the spring have been compressed for the 2.2 kg cart to end up moving at 1.5 m/s? (involves both momentum and energy) 2. Relevant equations p = mv Ek = 0.5mv2 Ep = 0.5kx2 3. The attempt at a solution i dont even know where to start !!