Problem $10$ A solid sphere of mass $4$kg and radius $0\mathrm{.}12$m starts from rest at the top of a ramp, inclined $15,$ and rolls to the bottom without slipping. $($For a sphere I $=0\mathrm{.}4$MR$2)$ The upper end of the ramp is $1\mathrm{.}2$m higher than the lower end. a$.$ What is the linear speed of the sphere when it reaches the bottom of the ramp? b$.$ What is the angular speed of the sphere when it reaches the bottom of the ramp? c$.$ What is the total kinetic energy at the bottom?