A BALL SUSPENDED BY A THREAD SWINGS IN A VERTICAL PLANE SO THAT IT'S ACCELERATION IN THE EXTREME POSITION AND LOWEST POSITION ARE EQUAL THE ANGLE θ OF THREAD DEFLECTION IN THE EXTREME POSITION WILL BE :
1. tan −1(2)
2. tan −1 (2)^1/2
3. tan −1 (1/2)
4. 2 tan −1 (1/2)
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