A) \[\text{1 }m/{{s}^{2}}\]
B) \[2\text{ }m/{{s}^{2}}\]
C) \[\text{3 }m/{{s}^{2}}\]
D) None of these
Correct Answer: B
Solution :
\[g=\frac{GM}{{{R}^{2}}}\] \[\Rightarrow \] \[\frac{g'}{g}=\frac{M'}{M}\left( \frac{R}{R'} \right)=\frac{{{M}^{2}}}{80M'}.{{\left( \frac{4R'}{R'} \right)}^{2}}=\frac{1}{5}\] \[\Rightarrow \] \[g'=\frac{g}{5}=2\,m/{{s}^{2}}\]
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