1. The problem statement, all variables and given/known data 1. Two magnetic hockey pucks sliding on a flat plane of frictionless ice attract each other, changing each other's direction of motion as they pass. We can (or cannot) realistically apply conservation of momentum to this situation because a. The system of interest floats in space b. The pucks are a functionally isolated system c. We can treat the interaction as a collision d. Conservation of momentum does not apply here 2. Two hockey pucks are sliding on a flat, horizontal, frictionless sheet of ice. One puck has twice the mass of the other. Initially, the light puck is moving east at 3 m/s while the heavy puck is moving west at 2 m/s. The pucks collide and stick together. The final velocity of the joined pucks is a. Eastward b. Westward c. Zero d. Impossible to determine e. Some other direction 2. Relevant equations 3. The attempt at a solution 1. b? I don't really understand conservation of momentum. 2. d. because we don't know mass?