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A missile weighing 400N on the earth surface is shot into th...

A missile weighing 400N on the earth surface is shot into the atmosphere to an altitude of 6.4 x \(10^{-6}\)m. Taking the earth as a sphere of radius 6.4 x \(10^{-6}\)m and assuming the inverse-square law of universal gravitation, what would be the weight of the missile at that altitude?

A.

100N

B.

200N

C.

400N

D.

800N

E.

1600N

Correct answer is A

W=\(\frac{mg}{4}= \frac{400}{4}=100N\)