The diameter of the ball is 0.06meter, it means that the radius is 3cm.
Then the volume will be \frac{4}{3}\pi r^4\approx 108 cm^3

You have provided that  mass m=0.0571 kg=57.1g
Then, the density of the ball is about 57/108\approx 0.5 g/cm^3. This seems to be quite small (less than water. ???).

I did check out your code and try to run it(step by step).
The value grow very rapidly. It might be due to some mistake (or wrong number or wrong sign) in the code.

Could you check out all those parameters again?