The moment of inertia of a sphere (rotating about a diameter( is given as I (sphere)=2/5MR^2 and the moment of inertia of a disk (rotating about its center) is given as I (disk)=1/2MR^2. If a disk and a sphere of equal mass,M,a and diameter are released simultaneously at the top of an incline and they roll without slipping, which will reach the bottom first?