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# Two Buckets of Sand

SATPHY-KR9GMZ

Two buckets of sand exert a gravitational force of 18 nanoNewtons on each other when their centers are separated by a distance of $d$.

How much force do they exert on each other when they are separated by a distance of $3d$?

A

2 nanoNewtons

B

6 nanoNewtons

C

9 nanoNewtons

D

54 nanoNewtons

E

We need to know the masses of the sand buckets to answer this question.