Hello!
The answer is: A. Projectile motion
Why?
Projectile motion involves movement in at least two dimensions (x and y).
In projectile motions, the movement on horizontal axis (x) goes at a constant velocity while in the vertical axis (y), it goes at a variable velocity because of the acting of the gravity force acceleration [tex](9.81 \frac{m}{s^{2} } )[/tex] and it's totally independent of the horizontal acceleration.
We can calculate the horizontal and vertical distance by using the following formulas:
[tex]x=v_{xi}*t\\y=v_{yi}*t-\frac{1}{2}*g*t^{2}[/tex]
Have a nice day!
