In article <3CE2C221.AD4ABAFA@gmx.de>, chr### [at] gmxde says...

> You have to take into account that due to buoyancy the influence of
> gravity is more than compensated under water.

Thats why they don't sink permanently... but nevertheless they should 
slow down much faster, since the (parmanent) friction of a moving ball 
under water should be much higher then the one of an elastic ball 
bouncing on the ground - unless it is not water but some exotic liquid 
with extremely low friction (like liquid helium).

I looked at the animation again, and it seems the balls are suddently 
accelerating when they go through the water surface from inside the water 
to the outside. A bug perhaps?

Lutz-Peter

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