JEE Main Physics question

A 2 kg stone at the end of a string 1 m long is whirled in a vertical circle at a constant speed. The speed of the stone is 4 m/sec. The tension in the string will be 52 N, when the stone is at

• (A)At the top of the circle
• (B)At the bottom of the circleCorrect
• (C)Halfway down
• (D)None of the above