$14-7.$ Determine the stiffness matrix $K$ for the truss. Take $A=0\mathrm{.}0015m^2$ and $E=200$GPa for each member.

$*14-8.$ Determine the vertical displacement at joint $(2)$ and the force in member $.$ Take $A=0\mathrm{.}0015m^2$ and $E=200$GPa. Take $A=0\mathrm{.}0015m^2$ and

Probs. $14-\frac{7}{14}-8$