Answer
$P_g=-2.6\times 10^4Pa$
Work Step by Step
According to Bernoulli's equation,
$P_g={\rho}g(-h)$
We plug in the known values in the equation to obtain:
$P_g=-1800\times 9.8\times 1.5$
$P_g=-2.6\times 10^4Pa$
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