If 2 objects had the same momentum, what must be true about the mass of the object that traveled the fastest?

Yes, the above-given statement is true

Explanation:

The product of the mass x the velocity will be the same for both. Momentum is the action of a body with a particular mass through space and there is the conservation of momentum. Momentum is described as the mass of the object multiplied by its velocity. Momentum (p) = Mass (M) * Velocity (v) Therefore for two objects with many masses to have a similar momentum, then the lighter one has to be moving quicker than the heavier object.