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


d

Physics & Space Science

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