An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ? = 30°, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?
A. 2.0 kg
B. 1.5 kg
C. 1.8 kg
D. 1.2 kg
E. 0.80 kg
Answer: D
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