A square aluminum (shear modulus is 25 × 10^9 Nm^-2 ) slab of side 60 cm and thickness 15 cm is subjected to a shearing force (on its narrow face) of…

A square aluminum (shear modulus is $\displaystyle 25 \times 10^9 \mathrm{Nm}^{-2}$ ) slab of side $\displaystyle 60$ cm and thickness $\displaystyle 15$ cm is subjected to a shearing force (on its narrow face) of $\displaystyle 18.0 \times 10^4$ N . The lower edge is riveted to the floor. The displacement of the upper edge is \_\_\_\_ $\displaystyle \mu \mathrm{m}$.