Problem $1(75$ pts$)$

A straight prismatic beam $AC$ has a rectangular cross$-$section with width $b$ and height $h.$ Its total length is $4l,$ and its Young's modulus is $E.$ The beam is loaded as shown in the figure below.

$\backslash$table$[[b,h,l,E,q,x$

please determine deflection at x $=3$l

please calculate maximium normal stress on cross section at x $=3$l

please calculate maximium shear stress on cross section at x $=3$l