A child's ball $($a thin hollow uniform sphere$)$ of mass 31$\mathrm{.}9$ g and radius $0\mathrm{.}\mathrm{}384$ m starts from rest and rolls without slipping down an inclined plane of vertical height $4\mathrm{.}71$ m$.$ What is the angular speed of the sphere at the bottom of the inclined plane? Give your answer in rad$/$s.