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## Homework Statement

ِ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

## Homework Equations

Density = mass/volume

Momentum = mv

## 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?