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JAMB Physics 2002 Question 3

Question 3

Gravitational Field

If the distance between two suspended masses 10kg each is tripled, the gravitational force of attraction between them is reduced by

  1. A.one quarter
  2. B.one ninth
  3. C.one half
  4. D.one third.
Show the answer and explanation

Answer: B (one ninth)

Explanation

F ∝ 1/d2, so tripling d makes the force (1/3)2 = 1/9 of its old value.