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- 72N
- 28N
- 16N
- 32N

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Solution

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Lrt Re be the radius of earth

Given h=Re/2Since h is comparable to Re

So, gh=GM(Re+h)2

Putting h=Re/2,we get

⇒gh=49×GMR2e=4g9

Where g is acceleration due to gravity at the surface of earth

Therefore weight at a height equal to half of the earth's radius =49×72=32N

Hence correct answer is option D

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