1. The problem statement, all variables and given/known data ِA fountain of water the pushes water from a hole its radius = 2.5 cm with a speed of 30 m/s. This water hits a flat board that was put vertically in respect to the water and it is moving away of water with a speed of 6 meters 1) calculate the force that the water exerts on the board 2) Calculate this force if the board was moving to the water with a speed of 6 m/s and the water density is 1000 kg/m3 2. Relevant equations Density = mass/volume Momentum = mv 3. The attempt at a solution Aren't I missing something here? The question didn't give me the mass of the board.. Neither it told me the final speed of the water. How I am supposed to answer this?