From what we know, we can confirm that the other key variable that determines the momentum of the rugby players is the body mass of each player.
This has to do with the formula regarding how to calculate momentum. The formula takes into account two values. The question states that two athletes run at each other with the same velocity. Velocity is our first value, and by multiplying it by the body mass, we can calculate the momentum.
Therefore, given that momentum is calculated by multiplying the body mass by the velocity of the players, we can confirm that the other key variable that determines the momentum of the rugby players is the body mass of each player.
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