Q$1$ A Gexihle reckangular footiny, as shown in figure Q$1,$ is subjectod to a umiformly distributed loud $q=225k\frac{N}{m^2}.$ Determine the incrove in vertical strcss at a depth of $1m$ under points $A,$ B$,$ anal $C.$ The fooriny placed $0\mathrm{.}5m1$ below the ground sorface. The unit weipht of hoil $=16\mathrm{.}5k\frac{N}{m^3}$

$(20$ Marks$)$

Figure QI