A) 0.8
B) 0.25
C) 0.5
D) 0.4
Correct Answer: B
Solution :
[b] According to law of conservation of linear momentum, |
\[mv+4m\times 0=4mv'+0\] |
\[v'=\frac{v}{4}\] |
\[e=\frac{\text{Relative velocity of separation}}{\text{Relative velocity of approach}}=\frac{\frac{v}{4}}{v}\] |
\[e=\frac{1}{4}=0.25\] |
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