Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 9 - Think and Solve: 41

Answer

$$G \frac{(2m_{1})(2 m_{2})}{(2 d)^{2}} = G \frac{m_{1} m_{2}}{d^{2}} $$ When the distance is doubled, and the mass of each of the planets is doubled, the gravitational force is the same as it was before.
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