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A stone of mass 900 g is tied to a string and moved in a vertical circle of radius 1 m making 10 rpm. The tension in the string, when the stone is at the lowest point is (if π 2 = 9.8 and g = 9.8 m/s 2 )

1. 9.8 N
2. 8.82 N
3. 97 N
4. 17.8 N

Correct answer: 9.8 N

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