A worker slowly moves a $\backslash (5-\backslash$mathrm$\{$kg$\}\backslash )$ crate of Height $\backslash (\backslash$mathrm$\{$H$\}=1\mathrm{.}35\backslash$mathrm$\{$~m$\}\backslash )$ to the left along a loading dock by applying a force Pat corner B as shown. Know wing that the crate starts to tip about the edge E of the loading dock when a$=200$ mm $,$ determine the coefficient of kinetic friction between the crate and the loading dock.