What 2 motions combine to form projectile motion?!?

Question

Please help...Thank you!

Answer 1

There are more than two.

There is the the initial velocity, which is not usually horizontal, but is in a straight line. There is an acceleration downward due to gravity. There is a gradual slowing down due to friction in the air. There is usually a rotational motion when the projectile leaves the barrel. There is a turning motion due to the Coriolis force (slight, but there). The first two are the most significant.

Answer 2

Constant velocity in the +x direction
& acceleration in the -y direction.

X(t) = X0 + Vx(t)
Y(t) = Y0 + Vy(t) + 1/2(Ay)(t)^2

Where
X0 = initial x position
Y0 = initial y position
Vx = horizontal velocity
Vy = vertical velocity
Ay = vertical acceleration ie. gravity

Does that look familiar

Answer 3

Horizontal velocity and gravity in the vertical axis.