A hollow spherical shell with mass 225 kilogram rolls

Question

A hollow spherical shell with mass 2.25 kilogram rolls without slipping down a slope that makes an angle of 30.0 degree with the horizontal.

a. Obtain the magnitude of the acceleration of the center of mass of the spherical shell. Take the free-fall acceleration to be g = 9.80 m/s².

b. Obtain the magnitude of frictional force acting on spherical shell. Take the free-fall acceleration to be g = 9.80 m/s².