A projectile fixed at an angle of 18° has certain horizontal range. State another angle of projection for the same horizontal range.

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A projectile fixed at an angle of 18° has certain horizontal range. State another angle of projection for the same horizontal range.

Question: A projectile fixed at an angle of 18° has certain horizontal range. State another angle of projection for the same horizontal range.

Answer:

 The horizontal range of a projectile is same, if it  is projected with angle θ and 90-θ.Here θ=18° next angle to achieve same range must be 90°-18°=72° .

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