A) \[\sqrt{2({{u}^{2}}-gl)}\]
B) \[\sqrt{{{u}^{2}}-gl}\]
C) \[u-\sqrt{{{u}^{2}}-2gl}\]
D) \[\sqrt{2gl}\]
Correct Answer: A
Solution :
Key Idea : When stone reaches a position where string is horizontal, it attains the energy partially as kinetic and partially as potential. When stone is at its lowest position, it has only kinetic energy, given by \[K=\frac{1}{2}m{{u}^{2}}\]You need to login to perform this action.
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