A) 2 kg
B) 1.2 kg
C) 3 kg
D) 1.5 kg
Correct Answer: B
Solution :
\[{{m}_{1}}=2\,kg\]and\[{{v}_{1}}=\left( \frac{{{m}_{1}}-{{m}_{2}}}{{{m}_{1}}+{{m}_{2}}} \right)\,{{u}_{1}}\]\[=\frac{{{u}_{1}}}{4}\](given) By solving we get\[{{m}_{2}}=1.2\,kg\]
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