A parent yak pushes a baby yak stroller.  Compared to the magnitude of the force exerted on the stroller by the parent, the magnitude of the force exerted on the parent by the stroller is A. larger B. smaller, but greater than zero C. the same D.zero

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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!