A 020-Kg Object Attached to the End of a String Swings

Multiple Choice

A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm) . At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?

A) 7.0 N
B) 2.0 N
C) 3.1 N
D) 5.1 N
E) 6.6 N