A) \[72\,\,N\]
B) \[28\,\,N\]
C) \[16\,\,N\]
D) \[32\,\,N\]
Correct Answer: D
Solution :
\[W\]on the earth's surface\[=72\,\,N=mg\], \[h=\frac{R}{2}\] \[{{g}_{h}}=\frac{g}{{{\left( 1+\frac{h}{R} \right)}^{2}}}=\frac{g}{{{\left( 1+\frac{1}{2} \right)}^{2}}}=\frac{g}{9}(4)\]\[W\] at a height\[=m{{g}_{h}}\] \[=m\times g\left( \frac{4}{9} \right)=72\times \frac{4}{9}=32\,\,N\]
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