Question 1031479
{{{V=ux*x}}}
{{{V=ux^2}}}
{{{V/x^2=u}}}
{{{u=V/x^2}}}



{{{S=ux+ux+ux+ux+x^2}}}
{{{S=4ux+x^2}}}
Substitute for u.
{{{S=4(V/x^2)x+x^2}}}
{{{S=4(Vx/x^2)+x^2}}}
{{{S=4V/x+x^2}}}