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Select the correct statements :
I) Weight of the body at centre of the earth in zero
II) Weight of the body at poles remains same even earth stops rotation
III) Gravitational force is non conservative force
IV) The escape velocity is always more than orbital velocity.

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I, II, IV are correct

I, II, III are correct

I, II are correct

All are correct

answer is A.

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Detailed Solution

I – is true
II – is true
III – is false because Gravitational force is conservative force
IV is true, $v_{e} = \sqrt{2} v_{0} = 1.44 v_{0}$

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