A) \[\frac{5}{12}\]
B) \[5\]
C) \[\frac{1}{5}\]
D) \[\frac{12}{5}\]
Correct Answer: B
Solution :
If target is at rest then final velocity of bodies are \[{{v}_{1}}=\left( \frac{{{m}_{1}}-{{m}_{2}}}{{{m}_{1}}+{{m}_{2}}} \right)\ {{u}_{1}}\] ?(i) and \[{{v}_{2}}=\frac{2{{m}_{1}}{{u}_{1}}}{{{m}_{1}}+{{m}_{2}}}\] ?(ii) From (i) and (ii) \[\frac{{{v}_{1}}}{{{v}_{2}}}=\frac{{{m}_{1}}-{{m}_{2}}}{2{{m}_{1}}}=\frac{2}{5}\]Þ\[\frac{{{m}_{1}}}{{{m}_{2}}}=5\]You need to login to perform this action.
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