20. What is the gravitational force of attraction between two 60kg and boy girl sitting 2 m apart? Will their attraction increase or decrease when they are at a distance of 1 m apart? D= 2m, m1 -60 kg, m2 =60kg (G = 6.67 × 1011 Nm2kg-2), F= G (m1m2)/d2

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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!