help me answer these questions:

Block X Block Y A student plans to conduct an experiment in which the momentum of a two-object system can be determined immediately before and after a collision takes place. The student slides block X at an unknown constant speed toward an identical block, block Y, that is initially at rest, as shown in the figure. There is negligible friction between the blocks and the surface. Momentum of Block X Before Momentum of Block Y Before Momentum of Block X After Momentum of Block Y After Trial Number Collision (kgT'\") Collision