Animation of a projectile

In this animation you can simulate the motion of a projectile subjected only to the gravitational attraction of the Earth (so we are neglecting air friction). You can choose the initial height, module of velocity, and angle.
When the projectile hits the ground the animation stops and you can see some information about the trajectory.
You can also choose to show some vectors during the motion.
Pay attention:

Initial velocity must be non-negative.
Initial height must be non-negative as well.
Initial angle must be in the interval [-90,90].

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You need Java 7 to see this applet.

There are probably some bugs here and there, when you find them just tell me. And I still don't know how to implement the "show trail" function, that's why you can't click on it. Next applets will be better I hope. Enjoy!