The neutron number is not conserved in a beta decay. Is this a violation of the conservation of nucleons? Explain.

Which of these is not a violation of conservation of mass?

When you lift a box from the floor and put it on an almirah the potential energy of the box increases but there is no change in its kinetic energy. Is it violation of conservation of energy. Explain.

Explain the law of conservation of energy .

The kinetic energy of a freely falling ball is not conserved. Why is this not a violation of the law of conservation of energy ?

Explain the law of conservation of momentum.

Explain beta - decay ?