A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the string is horizontal, the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
A. 16 N
B. 17 N
C. 21 N
D. 11 N
E. 25 N
Answer: A
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