A) \[\sqrt{12.25}\,m{{s}^{-1}}\]
B) \[4.9\,m{{s}^{-1}}\]
C) \[7\sqrt{2}\,m{{s}^{-1}}\]
D) \[\sqrt{9.8}\,m{{s}^{-1}}\]
Correct Answer: A
Solution :
When a string fixed with a nail, moves along n vertical circle, then the minimum horizontal velocity at the lowest point of circle is given by \[\upsilon =\sqrt{5\,rg}\] \[=\sqrt{5\times 0.25\times 9.8}\] \[=\sqrt{12.25}\,m/s\]
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