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[A. Constant]
As we know that the horizontal velocity of a projectile is constant. There is a vertical acceleration caused by gravity; its value is:
![g = 9.8 \: {m/s}^(2)](https://img.qammunity.org/2019/formulas/physics/high-school/voa3zey5bnwaqrfs3gfs3atx6m8mn6nolx.png)
So, the vertical velocity of a projectile changes by 9.8 m/s each second, The horizontal motion of a projectile is independent of its vertical motion.
Hence, during the course of trajectory, the horizontal component of the velocity is constant.
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