3. A large water tank, open at the top, has a small hole in the bottom. When the water level is 30 m above the bottom of the tank, the speed of the water leaking from the hole: (A) is 2.5 m/s (B) is 24 m/s (C) is 44 m/s (D) cannot be calculated unless the area of the hole is given (E) cannot be calculated unless the areas of the hole and tank are given