A) \[\sqrt{\text{l2}}\text{m}/\text{s}\]
B) \[\sqrt{18}\text{m}/\text{s}\]
C) \[\sqrt{24}\text{m}/\text{s}\]
D) \[\sqrt{32}\text{m}/\text{s}\]
Correct Answer: B
Solution :
From law of conservation of energy Potential energy = kinetic energy Given, potential energy \[=\frac{75}{100}\times 12=9\,J\]... (i) Kinetic energy \[=\frac{1}{2}m{{v}^{2}}\] ... (ii) Equating Eqs. (i) and (ii), we get \[\frac{1}{2}m{{v}^{2}}=9\] \[\Rightarrow \] \[v=\sqrt{\frac{9\times 2}{1}}=\sqrt{18}\,m/s\]
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