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?

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100 N

150 N

200 N

250 N

answer is A.

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Detailed Solution

Acceleration due to gravity at a depth d,gd=g1-dR For d=R/2⇒gd=g1-R/2R=g2 Required weight W'=mgd=mg2=W2=2002=100 N

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