A) 0.4 M
B) 1.6 M
C) 0.68 M
D) 1.68 M
Correct Answer: C
Solution :
\[M=\frac{{{m}_{1}}{{v}_{1}}+{{m}_{2}}{{v}_{2}}}{{{v}_{1}}+{{v}_{2}}}=\frac{0.6\times 800+1\times 200}{1000}\] \[=\,\,\,\frac{480+200}{1000}=\frac{680}{1000}=0.68\,\,M\]
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