$2\mathrm{.}15.$ A tensile test is conducted on a wide$-$width geotextile samplewithawidthof $200$ mm $.$ Testresultsareshown below:

$\backslash$table$[[$Strain $(\%),2,4,6,8,10,12],[$Tensile force $($kN$),2\mathrm{.}16,4\mathrm{.}32,5\mathrm{.}80,6\mathrm{.}56,7\mathrm{.}24,7\mathrm{.}72]]$

Determine $(1)$ initial modulus, $(2)$ secant modulus at $2\%$ strain, and $(3)$ tensile stress at $10\%.$