A rock pulled by two cords in the opposite direction moves at a constant acceleration. What can be inferred from the magnitude of the forces acting on the rock? a. The rock is accelerating, therefore the forces must be balanced for it accelerate. b. The direction of the force tells us that the magnitude of the forces are unequal. c. The body is moving at constant acceleration, therefore the forces are balanced and the magnitudes are the same. d. These forces did not cancel each other. The magnitude of the forces are not the same. e. No Answer

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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!