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A running back with a mass of 70 kg and a speed of 9 m/s collides with, and is held by, a 105-kg defensive tackle

A running back with a mass of 70 kg and a speed of 9 m/s collides with, and is held by, a 105-kg defensive tackle going in the opposite direction. How fast must the tackle be going before the collision for their speed afterward to be zero?

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