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Q.

The weight of an object is 90 kg at the surface of the earth. If it is taken to a height equal to half of the radius of the earth, then its weight will become [MPPET 2013]

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a

135 kg

b

45 kg

c

60 kg

d

40 kg

answer is D.

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Detailed Solution

Weight of the object at height h above the surface of the  earth, w'=w1+hR2⇒w'(h=R/2)=w(1+1/2)2⇒  w'=w×49=90×49=40 kg
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