How many times weaker will it be?
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Gravity varies as the inverse of the square of the distance.
Move objects so they are 2 times farther apart, gravity between them is 2 squared (2 x 2, or 4) times less.
So if they are 5 times farther apart, the gravity between them is 5 squared (5x5 or 25) times less.
Move objects so they are 2 times farther apart, gravity between them is 2 squared (2 x 2, or 4) times less.
So if they are 5 times farther apart, the gravity between them is 5 squared (5x5 or 25) times less.