Before After As shown in the figure, nucleus X of mass mx collides with nucleus Y of mass m, that is momentarily at rest. The masses are not equal. Both nuclei then move off in the direction as shown. It is unknown whether energy is lost during the interaction, but no other particles are produced. Which of the following claims is correct about which quantities must be the same before and after the collision? (A) The total momentum of the two-nuclei system (B) The total mass of the two nuclei (C) The speed of nucleus X (D) It cannot be determined without knowing if energy was lost during the collision

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