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

g′=gRR+h2=gRR+R22=49g∴W′=49×W=49×72=32 N
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An object weights 72 N on earth. Its weight at a height of R/2 from earth is