A) \[40\text{ }cm{{s}^{-1}}\]
B) \[10\text{ }cm{{s}^{-1}}\]
C) \[30\text{ }cm{{s}^{-1}}\]
D) \[80\text{ }cm{{s}^{-1}}\]
Correct Answer: A
Solution :
Here, \[v\propto {{r}^{2}}\] \[\therefore \] \[\frac{{{v}_{1}}}{{{v}_{2}}}=\frac{r_{1}^{2}}{{{8}^{2/3}}.{{r}^{2}}}\] \[\frac{10}{{{v}_{2}}}=\frac{1}{4}\] \[{{v}_{2}}=40\,cm/s\]You need to login to perform this action.
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