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?
1) 16 N
2) 17 N
3) 21 N
4) 11 N
5) 25 N
Answer: 1