Q. A body is rolling down an inclined plane. If K.E. of rotation is 40% of K.E. in translatory state, then the body is a

A) Ring
B) Cylinder
C) Hollow ball
D) Solid ball
Explanation

(d) $\frac{1}{2}mv^{2}\left( \frac{K^{2}}{R^{2}} \right) = 40\%\ \ \frac{1}{2}mv^{2} \Rightarrow \ \therefore\frac{K^{2}}{R^{2}} = \frac{40}{100} = \frac{2}{5}$
$i.e.$ the body is solid sphere

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.