A) \[\sqrt{24}\]
B) \[\sqrt{32}\]
C) \[\sqrt{18}\]
D) \[\sqrt{9}\]
Correct Answer: C
Solution :
Potential energy of a body = 75% of 12 J mgh = 9 J Þ \[h=\frac{9}{1\times 10}=0.9m\] Now when this mass allow to fall then it acquire velocity \[v=\sqrt{2gh}=\sqrt{2\times 10\times 0.9}=\sqrt{18}\]m/s.
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