Editing Projectile motion (section)

=== Acceleration ===
Since there is acceleration only in the vertical direction, the velocity in the horizontal direction is constant, being equal to <math> \mathbf{v}_0 \cos\theta </math>. The vertical motion of the projectile is the motion of a particle during its free fall. Here the acceleration is constant, being equal to <var>g</var>.{{NoteTag|<var>g</var> is the [[Standard gravity|acceleration due to gravity]]. (<math>9.81\,\mathrm{m/s^2}</math> near the surface of the Earth).}} The components of the acceleration are: 
: <math> a_x = 0 </math>,
: <math> a_y = -g </math>.*

''*The y acceleration can also be referred to as the force of the earth'' <math display="inline">(-F_g/m)</math> ''on the object(s) of interest.''