A) Ring
B) Hollow cylinder
C) Solid cylinder
D) Hollow sphere
Correct Answer: D
Solution :
[d] \[\frac{\frac{1}{2}I{{\omega }^{2}}}{\frac{1}{2}M{{v}^{2}}}=\frac{40}{60}=\frac{2}{3}\]or \[\frac{\frac{I{{v}^{2}}}{{{R}^{2}}}}{M{{v}^{2}}}=\frac{2}{3}\]or \[I=\frac{2}{3}M{{R}^{2}}\] Clearly, the body is a hollow sphere.
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