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3. A 110 kg running back carries the ball south at 8 m/s. A 130 kg linebacker runs to make the tackle going north

3. A 110 kg running back carries the ball south at 8 m/s. A 130 kg linebacker runs to make the tackle going north at 5 m/s. In their collision, the linebacker wraps his arms around the runner to make the tackle. How fast are they moving together after the collision (before they fall to the ground)?

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