Two $0\mathrm{.}57-$kg basketballs, each with a radius of $18$ cm $,$

are just touching.

How much energy is required to change the separation between the centers of the basketballs to $1\mathrm{.}3$ m $?($Ignore any other

gravitational interactions.$)$

Express your answer in joules

$\backslash$Delta U$=,$J

How much energy is required to change the separation between the centers of the basketballs to $12$ m

$?($Ignore any other gravitational interactions.$)$

Express your answer in joules.