Answer
$-109J$
Work Step by Step
We can find $W_{nc_2}$ as follows:
$W_{nc}=W_{nc_1}+W_{nc_2}=E_f-E_i=K.E_f-0$
$\implies W_{nc2}=K.E_f-W_{nc_1}$
$W_{nc_2}=\frac{1}{2}mv_f^2-W_{nc_1}$
We plug in the known values to obtain:
$W_{nc_2}=\frac{1}{2}(72.0)(1.20)-(161)$
$W_{nc_2}=-109J$