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Assuming no water resistance, a big fish is gliding through the water with momentum 2.0kg m/s. It swallowed a small fish of mass 200g, moving in the opposite direction at a very fast speed of 17m/s relative to the big fish. As a result of that, the big fish felt a punch in his stomach and regretted his move. What was the final velocity of the big fish after the meal?

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