A stone is thrown straight up in the air.  A) Draw a free-body diagram of the stone on its path. Neglect air resistance. B) At the top of its path, the net force acting on the stone is : Greater than its weight. Greater than zero, but less than its weight. Instantaneously equal to zero. Equal to its 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!