A 040-Kg Mass Attached to the End of a String Swings

Multiple Choice

A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the string makes an angle of 40 degrees below the horizontal, the speed of the mass is 5.0 m/s. What is the magnitude of the tension in the string at this instant?

A) 9.5 N
B) 3.0 N
C) 8.1 N
D) 5.6 N
E) 4.7 N