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A 100 kg mass traveling west at 28.8 m/s collides with a 80 kg mass traveling east at 21.4 m/s. After a partially elastic collision,

A 100 kg mass traveling west at 28.8 m/s collides with a 80 kg mass traveling east at 21.4 m/s. After a partially elastic collision, the 100 kg mass moves away at 10.4 m/s at 54.1o south of west. What is the magnitude of the final velocity of the 80 kg mass?

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