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Q.

An object weights 72 N on earth. Its weight at a height of R/2 from earth is

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a

32 N

b

56 N

c

72 N

d

Zero

answer is A.

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Detailed Solution

W=mg=72N---(1) g'=GMR+h2=GM 1R+h2=GM 1R+R22=GM 13R22=GMR2 232=49g∵g=GMR2 ∴   W'=49×W=49×72=32N
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