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5. A mass of 500 g is rotated on a string 70 cm in a circular path. The string is slowly extended so that it

5. A mass of 500 g is rotated on a string 70 cm in a circular path. The string is slowly extended so that it is 110 cm long. If the initial speed of the mass was 5.7 m/s what is the speed of the mass after the string is extended? (4 marks)

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