A water cannon 2.15 m long and with a cross-sectional area of 11.0 cm2 is aimed straight up and ejects water out of the top at a speed of 8.8 m/s. It is fed by a pump at the bottom of the cannon, which has a cross-sectional area of 46.0 cm2. What is the difference in pressure of the water between the pump and the top of the cannon? Assume the density of the water is 998.2 kg/m3

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.