Mike and Carl are fighting over a 1 kg stick.  Mike pulls to the right with a force of 30 N and Carl pulls to the left with 31 N.  What is the acceleration (magnitude and direction) of the stick? (Ignore all other forces on the stick such as weight.)

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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!