A rectangular vessel of dimension  $(l\times b\times h)$ and mass ‘M’ contains a liquid density ‘$\rho$’. The vessel has an orifice at its bottom at a distance ‘c’ from the rear wall as shown in the figure 

Force ‘F’ that must be applied when maximum water stored is  $[M+\frac{hcb\rho }{2}]\frac{hg}{c}$

Force ‘F’ that must be applied when maximum water stored is  $[M+\frac{hcb\rho }{2}]\frac{lg}{c}$

The maximum volume of the water that can be stored when the vessel is accelerated is  $\frac{hlb}{2}$

The maximum volume of the water that can be stored when the vessel is accelerated is  $\frac{hcb}{2}$