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Big yellow fishing swimming at 2.0m/s swallows little green fish at rest. Big yellow fish is 3 times as massive as little green fish. After big fish swallows little fish, they move together at the same final speed 1.5m/s with a combined mass of 4m. Model this as a completely inelastic collision. What fraction of big yellow fish's initial kinetic energy was lost is this collision?

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