Fluids question?

Water flows through a pipe that gradually descends from a height of 6.78 m to the ground. Near the top, the cross-sectional area is 0.4 m^2, and the pipe gradually widens so that its area near the ground is 0.8 m^2. Water leaves the pipe at a speed of 16.8 m/s. What is the difference in the water pressure between... show more Water flows through a pipe that gradually descends from a height of 6.78 m to the ground. Near the top, the cross-sectional area is 0.4 m^2, and the pipe gradually widens so that its area near the ground is 0.8 m^2. Water leaves the pipe at a speed of 16.8 m/s. What is the difference in the water pressure between the top and bottom of the pipe?
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