The plane height of the paper as a function of time is given by: 
 

 Where, 
 g: acceleration of gravity 
 t: time 
 vo: initial speed of the paper plane 
 me: initial height of the paper plane 
 Therefore, because the height of the plane as a function of time has a parabolic trajectory, then this is an example of a projectile movement. 
 Answer: 
 this is an example of projectile motion because height as a function of time has a parabolic trajectory: 
 
