by ScienceGeek24
Tags: sphere
 P: 614 it actually tells you in the question ;) "What fraction of its kinetic energy is rotational?" in other words: Which part of the total kinetic energy is rotational kinetic energy? Thus, we are looking for the rotational part of the total kinetic energy. if you have $\frac{\frac{1}{2}mv^{2}}{\frac{1}{2}mv^{2}+\frac{1}{5}mv^{2}}$ then what is that representing?
 P: 614 is $\frac{1}{2}mv^{2}$ the rotational kinetic energy?