Mechanics, conservation of momentum.

[consciousness]

I have thought about this problem a bit and it seems to me that the tank should move to -x direction with a constant velocity(conservation of momentum) until the water hits the vertical part of the tap after which the tank would stop moving.

 

[BruceW]

But one thing that confuses me is how can this be the speed of the tank if we found out the tank does not move??

Exactly. The tank does not move, so this tells you that the speed of the tank is zero.

 

[sg001]

i checked with my physics instructor and the answer is not zero the tank does have a final velocity!
now I am really confused.
help!