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A body weighs 200 N on the surface of the earth. How much will it weigh half way down to the centre of the earth ?

(1) 150 N

(2) 200 N

(3) 250 N

(4) 100 N
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Ans: (4) 100 N

Sol. Given W = mg = 200 N

$m={200\over10}=20Kg$

W' = 100 N

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