A disk of moment of inertia I, mass M, and radius R has a cord wrapped around it tightly as shown in the diagram. The disk is free to slide on its side as shown in the top down view. A constant force of T is applied to the end of the cord and accelerates the disk along a frictionless surface. After the disk has accelerated some distance, determine the ratio of the translational KE to total \mathrm{KE} of the disk,
K E_{\text {translational }} / K E_{\text {total }}=
Answer Choices
A. \frac{I}{M R^{2}}
B. \frac{M R^{2}}{I}
C. \frac{I}{3 M R^{2}}
D. \frac{I}{M R^{2}+I}
E. \frac{M R^{2}}{M R^{2}+I}
