A 40-Kg Mass Attached to the End of a String Swings

Multiple Choice

A 4.0-kg mass attached to the end of a string swings in a vertical circle of radius 2.0 m. When the string makes an angle of 35° with the vertical as shown, the speed of the mass is 5.0 m/s. At this instant what is the magnitude of the force the string exerts on the mass?

A) 50 N
B) 82 N
C) 89 N
D) 11 N
E) 61 N