A sphere of mass 2   kg and radius 0 . 5   m is rolling with an initial speed of 1   m  …

A sphere of mass $2 \mathrm{kg}$ and radius $0.5 \mathrm{m}$ is rolling with an initial speed of $1{ \mathrm{m} \mathrm{s}}^{-1}$ goes up an inclined plane which makes an angle of $30°$ with the horizontal plane, without slipping. How low will the sphere take to return to the starting point $A$?