A) ring
B) cylinder
C) hollow ball
D) solid ball
Correct Answer: D
Solution :
\[\frac{1}{2}m{{v}^{2}}\left( \frac{{{K}^{2}}}{{{R}^{2}}} \right)=40%.\frac{1}{2}m{{v}^{2}}\] \[\Rightarrow \] \[\frac{{{K}^{2}}}{{{R}^{2}}}=\frac{40}{100}=\frac{2}{5}\] This will imply, \[I=\frac{2}{5}M{{R}^{2}}\] Thus, the body is a solid sphere (solid ball).
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