What quantities remain constant in projectile motion?

Answer 1

All that I can think of are:

1.) Gravity

2.) Wind

2.A) wind speed

2.B) direction of wind

3.) Angle of trajectory

4.) Initial speed of projectile

5.) Material through which projectile travels (as in density)

6.) Mass of projectile

7.) Spin

7.A) speed of spin

7.B) axis/axes spining occurs on

8.) Shape of projectile

9.) Temperature of medium projectile is in

10.) Size of projectile (as in height, width, and depth)

11.) Weighting of projectile

12.) Obsturctions to projectile's path

In a vaccuum, though, these are the variables:

1.) Speed of object

2.) Obstructions in path

3.) Gravity

Answer 2

-- horizontal component of velocity

-- horizontal component of acceleration (zero)

-- vertical component of acceleration (g)

Answer 3

-- horizontal velocity

-- vertical acceleration

Answer 4

The Mass.