The mutual force of gravitational attraction between two masses is 500 N. a) lf the masses are moved five times as far apart, what is their new mutual force of gravitational attraction? b) lf the masses are moved five times closer, what is their new mutual force of gravitational attraction?

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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!