Water enters through end A with speed `v_(1)` and leaves through end B with speed `v_(2)` of a cylindrical tube AB. The tube is always completely fielled with water . Im case I, the tube is horizontal and in case II, it is vertical with end A upwards and in case III, it is vertical with end B upwards. We have `v_(1)=v_(2)` for

Options

A. case I
B. case II
C. case III
D. each case

Answer

D