$0 = {u^2} - 2as$

$s = \frac{{{u^2}}}{{2a}}$ $⇒ s \propto {u^2}$

$\frac{{{s_2}}}{{{s_1}}}\, = \,{\left( {\frac{{{u_2}}}{{{u_1}}}} \right)^2}\, = \,{\left( {\frac{{60}}{{30}}} \right)^2}\, = \,4$

$⇒ {s_2} = 4{s_1} = 4 \times 8$

${S_2}\, = \,32\, metres.$