An inverted tube barometer is kept on a lift with a moving downward with a deceleration $\alpha $ . The density of mercury is $\rho$ and acceleration due to gravity is $g$ . If the atmospheric pressure be $P_0$ then
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$P_{o}=\rho(g+a) h \Rightarrow h=\frac{P_{0}}{\rho(g+a)}$
$p(g+a)$
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