A cylindrical shell $($mass $1$ kg$,$ radius $0\mathrm{.}4$m$)$ rolls $($starting from rest$)$ without slipping down a $5$m long plane inclined at $45\backslash$deg with respect to the horizontal.

A$)$ find the time it takes to roll down the ramp

B$)$ what is the speed of the cylinder shell $($center of mass$)$ at the bottom of the ramp?

C$)$ what is the frictional force that acted on this rolling spherical shell?