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4.The angle of projection of a projectil...

4.The angle of projection of a projectile which is projected with certain velocity from ground is `(pi)/(8)` with horizontal and its horizontal range is `R`.The angle with the horizontal for another projectile having same range `R` and speed is [NCERT Pg.78]
(1) `(3 pi)/(8)`
(2) `(pi)/(4)`
(3) `(pi)/(3)`
(4) `(pi)/(6)`

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