A tube of uniform cross section always has water flowing through it. It is kept vertical in such a way that water enters from top and leaves from the bottom. If the speed at a point A below the opening is ‘v’, what will be the speed at a point B vertically below A such that the distance between A & B is ‘2h’?

A tube of uniform cross section always has water flowing through it.

1.	A tube of uniform cross section always has water flowing through it. It is kept vertical in such a way that water enters from top and leaves from the bottom. If the speed at a point A below the opening is ‘v’, what will be the speed at a point B vertically below A such that the distance between A & B is ‘2h’?
A.	v
B.	\(\sqrt{v^2 + 4gh}\)
C.	\(\sqrt{v^2 + 2gh}\)
D.	v/2
Answer» B. \(\sqrt{v^2 + 4gh}\)