A$20$m$.$ long beam AB is

subjected to a distributed load

which

Is constant $50$k$($N$)/($m$)$

between x$=4$m and

x$=8$m$.$

Varies uniformly from $50$

k$($N$)/($m$)$ at x$=8$m to $0$k$($N$)/($m$)$

at x$=20$m$.$

Determine the reactions at pin

A and roller B$.$

Write the value for the force at

B here $($in kN $).$