A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this particle were projected with the same speed at an angle ' ' to the horizontal, the maximum height attained by it equals 4R . The angle of projection, , is then given by :

1. A. = -1 ( 2R gT 2 ) 1/2
2. B. = -1 ( 2R gT 2 ) 1/2
3. C. = -1 ( 2gT 2 2R ) 1/2
4. D. = -1 ( gT 2 2R ) 1/2

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