A box weighing 50 N rests on a horizontal surface.  A person pulls with a force of 10N to the right and it does not move.  In order for you to move, you need another person who pulls vertically.  What is the minimum force that the other person needs to exert in order for it to move?  Coefficient of static friction = 0.4

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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!