A thin-walled hoop (ring) of mass M and radius R rotates about its central axis at an angular speed of 4rads−1. A solid sphere of the same mass and radius rotates about an identical axis at 6rads−1. Which object has the greater rotational kinetic energy?
a) The sphere
b) Both have the same rotational kinetic energy
c) The hoop
d) Not enough information is provided