A) \[\sqrt{\text{32}}\text{ m}/\text{s}\]
B) \[\sqrt{\text{24}}\text{ m}/\text{s}\]
C) \[\sqrt{\text{l8}}\text{ m}/\text{s}\]
D) \[\sqrt{\text{9}}\text{ m}/\text{s}\]
Correct Answer: C
Solution :
\[K.E.=\frac{1}{2}m{{v}^{2}}\] \[\therefore \] \[12\times \frac{75}{100}=\frac{1}{2}\times 1\times {{v}^{2}}\] \[\Rightarrow \] \[{{v}^{2}}=18\] \[\Rightarrow \] \[v=\sqrt{\mathbf{18}}\mathbf{m/sec}\].
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