A manometer connected to a closed tap reads 3.5×105 N/m2. When the valve is opened, the reading of manometer falls to 3.0×105 N/m2 , then velocity of flow of water is
(a) 100 m/s                                       (b) 10 m/s
(c) 1 m/s                                           (d) 1010 m/s

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