Water coming out of the mouth of a tap and falling vertically in stream line flwo forms a tapering column. i.e., the area of cross-section of the liquid column decreases as it moves down which of the following is the most accurate explanantion for this-

In the previous question, at the mouth of the tap the area of cross-section is 2.5 cm^2 and the speed of water in 3 m//s . The area of cross-section of the water column 80 cm below the tap is.

Water from a tap of cross sectional area 1 cm^2 starts falling down vertically, with a speed of 1m//s . What is the area of cross section of the stream of water at a distance of 20cm below the mouth of the tap? [Assume that (1) the flow is steady, (2) pressure is constant throughout the stream of water and g= 10m//s^2 ]