just after impact 
Newton's law of restitution gives:-
A) \[{{v}_{1}}=3\,eu\]
B) \[u=3\,e{{v}_{1}}\]
C) \[{{v}_{1}}=2\,eu\]
D) It cannot be applied as the masses are not known
Correct Answer: B
Solution :
\[e=\frac{velocity\,\,of\,\,separation}{velocity\,\,of\,approach}\] \[\Rightarrow \] \[e=\frac{{{v}_{1}}-2{{v}_{1}}}{3u-6u}=\frac{{{v}_{1}}}{3u}\] \[\Rightarrow \]\[{{v}_{1}}=3eu\]
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