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The mass of a bullet times the velocity of the bullet or the momentum of a bullet could be equal to the mass of a truck times the velocity of the truck or the momentum of truck. But we know that the mass of a bullet is much less than the mass of a truck, and therefore we know that then the velocity of the bullet. See answer (1) momentum is mass times velocity. A bullet could theoretically have the same momentum as a moving truck if the bullet's speed is great enough.