A projectile of mass "m" is launched from the origin (0,0) with a velocity "v₀" at an angle "θ" lying between 0 and 90 degrees. The reference frame for the motion of the projectile in the xy-plane is defined by the origin (x₀, y₀) and the basis vectors i, j, where i and j are unit vectors along the x and y axes, respectively. Assume that the launching and landing of the projectile are on the same level ground, the influence of drag forces is neglected, and the projectile is under the influence of gravity only. Also, consider the projectile as a particle. Determine the degrees of freedom for the motion of the projectile.