Answer
${\Delta}x=0.103m$
Work Step by Step
According to Hook's law,
$F=K{\Delta}x$
This can be rearranged as:
${\Delta}x=\frac{F}{K}$
${\Delta}x=\frac{mg}{K}$
We plug in the known values to obtain:
${\Delta}x=\frac{0.20(9.8)}{19}=0.103m$