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. I

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} )