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We have to assume that both bodies are initially moving along the same straight line

in opposite directions, so the collision is "head on".

We also have to assume that the collision is "elastic", meaning that none of the

original kinetic energy is lost to heat.

The final momentum is 20 Kg-m/s in the direction opposite to the original 80 kg-m/s motion.

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Q: When an object with a momentum of 80 kg by meters per second collides with an object with a momentum of negative 100 kg times meters per second the total momentum after the collision is?
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