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A stone of mass 0.2 kg is tied to one end of a thread of length 0.1 m whirled in a vertical circle. When the stone is at the lowest point of circle, tension in thread is 52 N. The kinetic energy of the stone at the lowest point is: (g = 10 m/s²)
A
2.5 J
B
3.5 J
C
4 J
D
6.5 J
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