A) 0.89
B) 0.56
C) 0.23
D) 0.18
Correct Answer: A
Solution :
As 20% energy lost in collision therefore \[mg{{h}_{2}}=80%\ \text{of }mg{{h}_{1}}\] Þ \[\frac{{{h}_{2}}}{{{h}_{1}}}=0.8\] but \[e=\sqrt{\frac{{{h}_{2}}}{{{h}_{1}}}}=\sqrt{0.8}=0.89\]
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