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If a 0.25 kg cart moving to the right with a velocity of +0.31 m/s collides...

If a 0.25 kg cart moving to the right with a velocity of +0.31 m/s collides inelastically with a 0.5 kg cart traveling to the left with a velocity of -0.22 m/s, what is the total momentum of the system before the collision?
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