A 050-Kg Mass Attached to the End of a String Swings

Multiple Choice

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