A) solid cylinder
B) solid sphere
C) disc
D) ring
E) hollow cylinder
Correct Answer: B
Solution :
\[\frac{1}{2}I{{\omega }^{2}}=40%of\frac{1}{2}m{{v}^{2}}\] \[\frac{1}{2}I{{\omega }^{2}}=\frac{40}{100}\left( \frac{1}{2}m{{r}^{2}}{{\omega }^{2}} \right)\] \[I=\frac{2}{5}m{{r}^{2}}\] So, the body is solid sphere.
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