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The side wall of a wide vertical vessel ...

The side wall of a wide vertical vessel of height `h=75 cm` has a narrow slit (vertical) running all the way down to the bottom of the vessel.
The length of the slit is `l=50 cm` and the width is `b=1 mm`. With the slit closed, water is filled to the top. Find the resultant reaction force of water coming out as the slit is opened.

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