$kN,$ and $F_y=77\mathrm{.}0kN,$ with the directions shown in the figure. Here $h=3\mathrm{.}0m$ and $d=3\mathrm{.}0m.$

Time left $3$:$32$

Figure P$3.$ Truss loaded with various point forces.

a$)$ Determine the number of zero$-$force members in the truss. $[1$ mark$]$

Number of zero$-$force members in the truss $=$

b$)$ Determine the force in member AK$.$ Use a positive value to indicate tension and a negative value to indicate compression. Provide your answer in $kN$ to $4$ decimal places. $[2$ marks$]$

Force in member $AK[kN]=$

c$)$ Determine the force in member AB$.$ Use a positive value to indicate tension and a negative value to indicate compression. Provide your answer in $kN$ to $4$ decimal places. $[2$ marks$]$

Force in member $AB[kN]=$

d$)$ Determine the force in member JI$.$ Use a positive value to indicate tension and a negative value to indicate compression. Provide your answer in $kN$ to $4$ decimal places. $[2$ marks$]$

Force in member $JI[kN]=$

e$)$ Determine the force in member $CI.$ Use a positive value to indicate tension and a negative value to indicate compression. Provide your answer in $kN$ to $4$ decimal places. $[2$ marks$]$

Force in member $Cl[kN]=$

f$)$ consider now the load Q is removed at joint I. Determine the force in member CD in this new scenario