A projectile is an object upon which the only force acting is gravity. The projectile motion refers to the motion of an object projected into the air at an angle. Online projectile motion for vertical velocity calculator to calculate initial vertical velocity(Vy0) or acceleration of gravity(g) or time(t) or vertical velocity at time(Vy). Just enter the values in a required field to calculate. Use this simple tool to perform projectile motion for vertical velocity calculations.