A) 1/4
B) 1/3
C) 2/3
D) ¾
Correct Answer: C
Solution :
\[{{m}_{1}}{{v}_{1}}-{{m}_{2}}{{v}_{2}}=({{m}_{1}}+{{m}_{2}})v\] Þ \[2\times 3-1\times 4=(2+1)\ v\]Þ \[v=\frac{2}{3}\ m/s\]
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