WAIT FOR IT - it takes a while to load.
This is an elaborate one. Initial height of the ball (in meters) is set with the radio buttons,
initial velocity by clicking on the purple region. List of keys that work listed at the lower left.
"CIRCLE" button changes to circular motion ("BACK" returns to projectile motion). Pressing "v" key while
in flight displays velocity and acceleration vectors (and during projectile motion also displays
velocity vectors from common point in upper right - great for demonstrating that only vy changes).
There is also a scientific calculator one can use to help predict velocity components and distances.
Don't press the "QUIT" button. It's intended for the stand-alone version (if you'd like it please
contact me at firstname.lastname@example.org - stand-alone is 33% bigger).