Question on: WAEC Physics - 1997
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
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Correct Option: A
W=\(\frac{mg}{4}= \frac{400}{4}=100N\)
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