A pendulum bob is attached to a string and allowed to swing. Which of the following statements is true with correct reasoning about the magnitude of the force the string exerts on the bob Fs on B and the magnitude of the force Earth exerts on the bob FE on B at the very bottom of the pendulum's swing? ΟΟΟ Ο FS on BFE on B because the bob is moving at a constant speed at that point so the forces exerted on it must be balanced. FS on BFE on B because the string would not be able to support the bob if it were not. FS on BFE on B because the bob is accelerating upward at the bottom of its swing. FS on BFE on B because of Newton's 3rd Law

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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!