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Question 5 A 300 g ball is swinging in a vertical circle on the end of a 1.20 m string. The speed of the ball at the bottom of the swing is 8.50 m/s. The minimum speed needed at the top of the circle is A. 3.43 m/'s B. 7.78 m/s C. 11.8 m/s D. 9.16 m/s