A) 2.8 N
B) 5.6 N
C) 12.5 N
D) 25.2 N
Correct Answer: B
Solution :
Weight of body on the surface of earth \[mg=12.6\,N\] At height h, the value of g? is given by \[g'=g\frac{{{R}^{2}}}{{{(R+h)}^{2}}}\] Now, \[h=R/2\] \[\therefore \] \[g'=g{{\left( \frac{R}{R+(R/2)} \right)}^{2}}=g\frac{4}{9}\] Weight at height \[h=mg\frac{4}{9}=12.6\times \frac{4}{9}=5.6N\]
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