Answer:
Quadruple
Step-by-step explanation:
See attachment.
The force is dependent on 1/r^2. if the new d is 1/2 r, the force would quadruple: ((1/2)r)^2 = (1/4)r^2
F1 = G(m1m2)/r^2
F2 = G(m1m2)/(1/4)r^2 or 4G(m1m2)/r^2
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