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7. A student ties a string of length 0.57 m to a 2.6 kg mass and then twirls it in a vertical circle so that it is traveling with a velocity of 3.8 m/s at the highest point of the circle. a) Calculate the tension in the string at this highest point in its circular path. [a) 3 marks b) Assuming negligible friction, at what speed will the mass be travelling at the lowest point of the circle? b ) 3 marks c) How much tension is in the string at this lowest point