A missile weighing 400N on the earth’s surface is shot into the atmosphere to an altitude of 6.4 x 10^−6m. Taking the earth as a sphere of radius 6.4 x 10^−6m 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:
Option A – 100N
Explanation
W=mg/4=400/4 = 100N
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