A) \[5\,\,m{{s}^{-1}}\]
B) \[10\,\,m{{s}^{-1}}\]
C) \[15\,\,m{{s}^{-1}}\]
D) \[17\,\,m{{s}^{-1}}\]
Correct Answer: A
Solution :
According to law of conservation of energy \[\frac{1}{2}m{{v}^{2}}_{\max }=mg({{h}_{2}}-{{h}_{1}})\] \[\Rightarrow \] \[{{v}_{\max }}=\sqrt{2g({{h}_{2}}-{{h}_{1}})}\] \[=\sqrt{2\times 10\times (2-0.75)}\] \[=\sqrt{2\times 10\times 1.25}=\sqrt{25}=5m{{s}^{-1}}\]You need to login to perform this action.
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