The tennis ball floats on top of the water.
The gas inside of a tennis ball will usually settle when frozen. In most cases this means that it will either freeze or cause the ball to shrink.
freeze it... the cold slows down the cinetic energy in the ball
it's not as bouncy
Well, yes and no. It depends how long you freeze it.
It gets brittle.
It gets cold
True. Freezing would compress the gas in the ball and reduce the elasticity of the rubber in it.
Yes, it does. Observe any tennis match or practice, or obtain a ball and just drop it and see what happens.
it would be classed as out
it bounces lower