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7. To determine the flowing velocity of a stream, a student dropped a ball into the water. He measured that in 5 minutes the ball

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7. To determine the flowing velocity of a stream, a student dropped a ball into the water. He measured that in 5 minutes the ball moved 15m downstream. What was the stream velocity? If the cross-sectional area of the flow channel was 10,000cm2, how much water (in m3 ) flowed through the stream in 1 hour? ( 15 points)

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