$1$

All members have same $E=70$GPa and same cross$-$section $A=200$ square mms$.$ A vertical load P$1=80-kN$ acts at Node E and a horizontal load P$2=40-kN$ acts at Node D$.$

Using the member forces due the the applied loads and member forces due to unit load, the vertical displacement at node $B$ is equal to what in $mm?$