A rock is thrown vertically into the air in free fall. At the very top of its trajectory the net force on it is A. Less than its weight B. More than its weight C. Its weight D. Not enough data

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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!