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8. A child is flying a kite attached to a 20 rn long string. At first, the kite is directly above the child, but it

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8. A child is flying a kite attached to a 20 rn long string. At first, the kite is directly above the child, but it blows east. The child notices that the angle between the string and the ground is decreasing by 5 each second. How quickly is the kite moving horizontally when the angle between the string and the ground is 76? [6 marks]

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