Posted by **Benny** on Tuesday, April 6, 2010 at 11:37pm.

Water is descending in a vertical pipe of diameter 7 cm and open to the atmosphere. At a lower point the water flows into a smaller pipe of diameter .84 cm. At a certain instant the depth of the water just above the narrowing point is 30 cm and the water is moving at 135 cm/s. How fast will water be going as it exits a small hole just below the narrowing point?

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