Momentum is conserved in all collisions, but energy is another matter. KEnergy is conserved in elastic collisions, but not inelastic. Total energy, as including heat, friction, etc is always conserved, but I am not certain that is the point to this question.
I would stick to momentum.
Would the answer to this question be total energy and momentum for both one dimensional and two dimensional collisions:
State the quantities conserved in one dimensional and two dimensional collisions.
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