A) 20 m/F
B) 40 m/s
C) 5 m/s
D) 10 m/s
Correct Answer: A
Solution :
Given, \[g=10\,m{{s}^{-2}}\] and \[h=20\,m\] |
We have |
\[v=\sqrt{2gh}\] |
\[v=\sqrt{2\times 10\times 20}=\sqrt{400}=20\,m{{s}^{-1}}\] |
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