Answer :
To known the motion and horizontal velocity.
What is motion?
In physics, motion changes over time depending on a body's position or orientation. Translation is the action of moving along a line or curve. Rotation is the term used to describe motion that modifies a body's orientation.
What is horizontal velocity?
The speed of a projectile is constant in the horizontal plane.Gravity causes a vertical acceleration that is 9.8 m/s/s downward. Each second, a projectile's vertical velocity changes by 9.8 m/s, A projectile's horizontal motion exists independently of its vertical motion.
If we perform an experimented see that the only force acting on the projectile is the gravity which acts vertically (neglecting air resistance). The component of gravitational force along horizontal direction is zero. Thus, there is no force acting horizontally acceleration in horizontal direction is zero.
Therefore, velocity in horizontal direction remains constant.
Learn more about motion from the given link.
https://brainly.com/question/28205978
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