A vertical jet of water leaves a nozzle at a speed of 10 m/s and a diameter of 20 mm. It suspends a plate having a mass of 1.5 kg. What is the vertical distance h?
NOTE: I am NOT asking for a solution. You can see the solution in the link below. I would like an explanation of the solution. Why do we take the flow at (2) in the linear momentum equation? If we use conservation of linear momentum in the y-direction, why don't we use the velocity of the flow in the y-direction (at 1) for our equation? Also, why is the weight of the fluid not considered in the conservation of linear momentum equation? Please explain these two parts.