The illustration below shows a ball on a rope. The mass of the ball is 0.4 kg. Assume that the mass of the rope is negligible. Assume that the friction is negligible. What is the maximum speed of the ball as it swings back and forth?
A) 0.14 m/s
B) 21 m/s
C) 7.0 m/s
D) 49 m/s
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