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a 100kg fullback running to the right at 5m/s collides head-on with a 75 kg defensive...

a 100kg fullback running to the right at 5m/s collides head-on with a 75 kg defensive back moving left at 3 m/s. After colliding, they stick together. What is their speed after the collision? Make sure you include the correct sgn in your answer. You do not need to include units in your answer, just the number

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