Q. A hollow sphere of diameter $0.2\ m$ and mass $2\ kg$ is rolling on an inclined plane with velocity $v = 0.5m/s$. The kinetic energy of the sphere is
A) $0.1\ J$
B) $0.3\ J$
C) $0.5\ J$
D) $0.42\ J$
Explanation
(d) $K_{N} = \frac{1}{2}mv^{2}\left( \frac{K^{2}}{R^{2}} + 1 \right) = \frac{1}{2} \times 2 \times (0.5)^{2} \times \left( \frac{2}{3} + 1 \right) = 0.42J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.