A rectangular tank $20ft$ long by $6ft$ deep by $7ft$ wide contains $3ft$ of water. If the linear acceleration horizontally in the direction of the tank$\text{'}$s length is $8\mathrm{.}05f\frac{t}{se{c}^2}.$

a$.$ Compute the total force due to the water acting on each end the tank

b$.$ Show that the difference between these forces $($at the ends of the tank$)$ equals the unbalanced force necessary to accelerate the liquid mass.