The distance between two objects $A$ and $B$ is $r$. The gravitational force between them is inversely proportional to the square of the distance. If the gravitational force between these two objects were inversely proportional to the fourth power of the distance,find the acceleration of object $A$.

  • A
    $a_A / r^2$
  • B
    $a_A / r^4$
  • C
    $a_A / r$
  • D
    $a_A / r^3$

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