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A rock weighs 72 N on Earth's surface. Its weight at height R_E/2 above the surface is:
A18 N
B48 N
C36 N
D32 N
Answer & Solution
Correct answer: D. 32 N
Weight falls as the inverse square of distance from the centre, so 72 N divided by (1.5)², which is 2.25, gives 32 N.
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