$2\mathrm{.}99$ The tank shown in Fig. P$2\mathrm{.}99$ is filled with water and accelerated. Find the pressure at $A$ if:

$($a$)a=20\frac{m}{s^2},L=1m$

$($b$)a=10\frac{m}{s^2},L=1\mathrm{.}5m$

Fig. P$2\mathrm{.}99$