What happens to the gravitational force if the masses of interacting bodies are doubled while the separation distance is doubled? a. Decreases by one-half c. Increases four times b. Decreases by one-fourth d. Remains the same

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!