A 0.80-kg object tied to the end of a 2.0-m string swings as a pendulum. At the lowest point of its swing, the object has a kinetic energy of 10 J. Determine the speed of the object at the instant when the string makes an angle of 50° with the vertical.
1) 5.6 m/s
2) 4.4 m/s
3) 3.3 m/s
4) 5.0 m/s
5) 6.1 m/s
Answer: 3