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?

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. A

    100 N

  2. B

    150 N

  3. C

    200 N

  4. D

    250 N

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    Solution:

     Acceleration due to gravity at a depth d,

    gd=g1-dR  For d=R/2gd=g1-R/2R=g2

     Required weight W'=mgd=mg2=W2=2002=100 N

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