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A heavy ball with mass 10 kg is suspended by a rope of length 4.5 m. It is pulled to one side and released, swinging

A heavy ball with mass 10 kg is suspended by a rope of length 4.5 m. It is pulled to one side and released, swinging like a pendulum; at its lowest point, it reaches a speed of 6 m/s.

(a) What is the tension in the rope at that point?

(b) Explain in words (without using mathematics) why the tension in the rope here is greater than the weight of the ball.

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