A cylinder of height 20 m is completely filled with water. The velocity of efflux of water

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A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in ms^-1) through a small hole on the side wall of the cylinder near its bottom is

1. 20
2. 25.5
3. 10
4. 5

Answer

Use Bernoulli's theorem just inside and outside the hole

P_inside + ρgh + 0 = P_outside + (ρV²)/2

ρ x 10 x 20 = ρ x V²/2

V² = 400

V = 20

The correct option is A.