A river descends 20 m through rapids the speed of the water, Ask an Expert

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A river descends 20 m through rapids. The speed of the water is 3.0 m/s upon entering the rapids and 11 m/s upon leaving. What percentage of the gravitational potential energy of the water-Earth system is transferred to kinetic energy during the descent? (Hint: Consider the descent of, say, 10 kg of water.)

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