The beam shown in figure$2$ is selected using fy $=60,000$ psi and fc $=3000$ psi, normal weight. Determine the theoretical spacing s of #$3$ stirrups$($area$=2\backslash$times $0\mathrm{.}11$ in$2)$for each of the following shears: $1)$Vu$=45,000$ lb;$2)$Vu$=65,0001$b $($According to ACI $318)$ figure $2($unit: inch$)$