Energy of freely falling body

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

The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy ? Why ?

For a freely falling body

Prove that the energy remains constant in case of a freely falling body.

The KE of a freely falling body

Velocity-displacement graph of a freely falling body is

The force of freely falling body is directly proportional to

The average velocity of a freely falling body is numerically equal to half of the acceleration due to gravity. The velocity of the body as it reaches the ground is