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The examples in my book and the equations all seem to have the Radius in them, and my problem doesn't give a radius. The equation that is has is Vcm=Rw.

So i'm not sure what to do when I don't have the radius and only the mass.

Since is says it is a hollow sphere, am I supposed to do something with the motion of inertia ? With K=1/2Mv^2+1/2Iw^2 ?

And then I don't know how I'm supposed to find the frictional force and the coeffcient of friction. g(sinθ-μcosθ)=a ?