A) \[40\,m{{s}^{-1}}\]
B) \[20\,m{{s}^{-1}}\]
C) \[30\,m{{s}^{-1}}\]
D) \[15\,m{{s}^{-1}}\]
E) \[25\,m{{s}^{-1}}\]
Correct Answer: B
Solution :
Given\[r=40\text{ }m\]and\[g=10\text{ }m{{s}^{-2}}\] We have \[v=\sqrt{gr}\] \[=\sqrt{10\times 40}\] \[=\sqrt{400}\] \[=20\text{ }m{{s}^{-1}}\]You need to login to perform this action.
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