$(5)w=20\mathrm{.}00k\frac{N}{m}$

The propped cantilever beam shown is subjected to a uniformly distributed load of $w=20\mathrm{.}00k\frac{N}{m}$ over a portion of its span: Determine the magnitude of the reaction force acting at $B($in $kN).$ Assume EI is constant for the beam. Hint: The reaction force is greater than $37\mathrm{.}74kN$ and less than $59\mathrm{.}83kN.$