Euler's Example: Pipe Pressure

Water flows through a pipe. What pressure gradient is needed to accelerate water in a horizontal pipe at $6\frac{m}{s^2}?$

$-\frac{\text{d}\text{e}\text{l}}{\text{d}\text{e}\text{l}\text{l}}(p+z)=a_l$

$"$A$"$

$"$B$"$

acceleration: $6\frac{m}{s^2}$

"Pressure Gradient": $\frac{P}{l}$