Answer
$2.20m$
Work Step by Step
According to law of conservation of momentum
$mv_{\circ}+M(0)=(m+M)(v_f)$
This can be rearranged as:
$v_f=(\frac{m}{m+M})(v_{\circ})$
We plug in the known values to obtain:
$v_f=\frac{0.0105}{0.0105+1.35}(715)=5.52\frac{m}{s}$
Now the distance can be calculated as
$x=(v_f)(\sqrt{\frac{2h}{g}})$
We plug in the known values to obtain:
$x=(5.52)(\sqrt{\frac{(2)(0.782)}{9.81}})$
$x=2.20m$