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c) The mass of the ball is 0.10 kg and the string is 45 cm long. Ifthe tension in the string when the ball is

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c) The mass of the ball is 0.10 kg and the string is 45 cm long. Ifthe tension in the string when the ball is at the top of the circle is 5.75 N, what is the speed of the rock at that location? A roller coaster car filled with passengers has a mass of 4800 kg. What speed must it have at the top of a 75.0 m-tall vertical circular loop in order for the car not to fall off the track

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