You kick a smooth flat stone out on a frozen pond. The stone slides, slows down eventually stops. You conclude that: O The force pushing the stone forward finally stopped pushing on it O A net force acted on it all along O No net force acted on the stone O It simply "ran out of steam"

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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!