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The distance - time graph of a particle in a projectile motion is a curve, parabola. When a body is projected from the ground, it reaches a certain height and comes back to the ground. The path which it followed is a parabola and parabolas are symmetric. The general equation of a parabola is
y2 = 4a x (Quadratic polynomial)
If one of the root of the projectile is 
, then the other is
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