If at a height of 40 m, the direction of
motion of a projectile makes an angle
π/4 with the horizontal, then its initial
velocity and angle of projection are,
respectively
(a) 30, (1/2)cos^(−1) (−(4/5))
(b) 30, (1/2)cos^(−1) (−(1/2))
(c) 50, (1/2)cos^(−1) (−(8/(25)))
(d) 60, (1/2)cos^(−1) (−(1/4))
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