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Q.

A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth ?

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a

32 N

b

30 N

c

24 N

d

48 N

answer is A.

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Detailed Solution

mg=72g1g=RR+h2g1g=2R3R2

g1=49gF1=mg1=mx49g=49×72=32N

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