Problem 1.327

The side wall of a wide vertical cylindrical vessel of height \(h=75 \mathrm{~cm}\) has a narrow vertical slit running all the way down to the bottom of the vessel. The length of the slit is \(l=50 \mathrm{~cm}\) and the width \(b=1.0 \mathrm{~mm} .\) With the slit closed, the vessel is filled with water. Find the resultant force of reaction of the water flowing out of the vessel immediately after the slit is opened.