An open tank 2 m x 4 m rectangular horizontal section has a negligible weight and contains water to a depth of 1.5 m. It is acted upon by an unbalanced force of 50 kN parallel to longer side so that water is about to spill. If the tank is closed and the acceleration is increased by 4 m/s ², determine the new unbalanced force if the pressure on the surface is 30 kPa.

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