A 0.50-kg ball that is tied to the end of a 1.3-m light cord is revolved in a horizontal plane, with the cord making a 30° angle with the vertical. (a) Determine the ball's speed. (b) If, instead, the ball is revolved so that its speed is 3.5 m/s, what angle does the cord make with the vertical? (c) If the cord can withstand a maximum tension of 9.2 N, what is the highest speed at which the ball can move?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”