The gravitational potential energy of a rocket of mass 100 kg at a distance 107 m from the earth's mass is 4.8 x 109 joule. The weight of the rocket in newton at a distance 109m is

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8×10−2

8×10−3

4×10−3

4×10−2

answer is D.

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Detailed Solution

U=GMmRr or GM=Urm……………….(1)weight at a distance r=mg=mGMR2……………………(2)∴ W=m1R2⋅Urm=UrR2=4×109(10)71092=4×10−2

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