* a projectile is any object upon which the only force is gravity,
* projectiles travel with a parabolic trajectory due to the influence of gravity,
* there are no horizontal forces acting upon projectiles and thus no horizontal acceleration,
* the horizontal velocity of a projectile is constant (never changing in value),
* there is a vertical acceleration caused by gravity; its value is 9.8 m/s/s, down,
* 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.
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