A) \[100m/{{s}^{-2}}\]
B) \[3m/{{s}^{-2}}\]
C) \[10m/{{s}^{-2}}\]
D) \[30m/{{s}^{-2}}\]
Correct Answer: B
Solution :
[b] \[a=\frac{{{m}_{2}}}{{{m}_{1}}+{{m}_{2}}}\text{ g=}\frac{3}{7+3}\times 10=3m/{{s}^{2}}\]
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