The problem about free fall ball(kangaroo2)

Hello, everyone

I want to make an animation of a ball falling into a box, but I get some problems.

First of all, the shape of the ball has run out of the box,I adjusted the
"SolidPointCollide"but it doesn’t improved.

second, if I want to let the falling ball inflate to the effect of filling the entire box, what should I do?

please help me


Ball (30.3 KB)