Answer:
[tex]a_x = 0[/tex]
Explanation:
When projectile is in air then the force on the projectile is only due to its weight
It is vertically downwards
[tex]F_g = mg(-\hat j)[/tex]
so here since we don't have any air drag or friction due to air so there will be no force along its tangent or along x direction
so the acceleration along x direction will be zero
[tex]a_x = 0[/tex]
[tex]a_y = - g[/tex]