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A spherical rock weighs $1000\ N$ on a certain planet. The planet is a billion times as massive as the rock and has a radius that is a billion times as great as that of the rock's radius.

How much force does the rock exert on the planet?

A

A thousand-billion Newtons.

B

A thousand-billion-billion Newtons.

C

A thousand billionths of a Newton.

D

A thousand billion-billionths of a Newton.

E

A thousand Newtons.

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