The question is: In outer space, 2 objects collide. 1. Explain if the momentum of one of the objects is conserved. 2. Is the total momentum of both objects conserved? Why? 3. Before the collision, the two masses have non-zero total kinetic energy. After the collision, explain if their total kinetic energy can or can not be zero. Wouldn't momentum be conserved for all (of one object and for both)? It's either elastic or inelastic collisions and in both momentum is conserved? I thought the objects transfer their momentum to each other. Isnt kinetic energy zero if the objects are at rest? Please help. Thank you so much.