45. A tank containing water to a height of 16.0 m also contains air above the water at a gauge pressure of 1.00 atm. Water flows out from the bottom through a small hole. What is the water’s speed? (A) 13 m / s (B) 19 m / s (C) 4.2 m / s (D) 23 m / s (E) 6.5 m / s