A pressure-pump has a horizontal tube of cross sectional area \( 10\,\text{cm}^{2} \) for the outflow of water at a speed of \( 20\,\text{m/s} \). The force exerted on the vertical wall just in front of the tube which stops water horizontally flowing out of the tube, is:
[given : density of water \( =1000\,\text{kg}/\text{m}^{3} \) ]
