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Force of gravitational attraction between two masses

The mutual force of gravitational attraction between two masses is 500 Newtons.

A) If the masses are moved 5 times as far apart, what is their new mutual force of gravitational attraction?

B) If the masses are moved five times closer, what is their new mutual force of gravitational attraction?

C) If one mass is doubled and another mass is tripled and the new masses are moved four times as far apart, what is their new mutual force of gravitational attraction?

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