3. Two identical, thin boards are hinged together at an end as shown below. The length of each board is l, and the total mass of each is m. Initially, one board hangs down freely from the hinge while the other is held at angle 0, by a horizontal string. Ignore any friction.

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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!