At any instance, the trajectory of all the projectiles is an arc of a circle . If you are not within the region enclosed by the parabola, then you are safe. Click the mouse button to suspend the animation, click it again to resume. Press Reset button for default values. Let us select case 2 to study the motion of a projectile.
Yellow circle is the starting point of a projectile.
You can click the mouse at that location and drag the mouse to change it. The red arrow represents the initial speed of the projectile. The gray line is the trajectory for the object without gravity. The parabola is the trajectory for the object with gravitational field. The vertical distance between the above curve is the free fall distance at that moment.