Miniature black holes. Left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 1*1011 kg (and a radius of only 1*10-16 m) reached Earth, at what distance from your head would its gravitational pull on you match that of Earth’s?

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Q: is the unit of Newtons.

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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!