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

State the transformation of energy when: Green plants prepare food-

A skier of mass $50 \text{kg}$ stands at $\text{'}A\text{'}$ at the top of a ski jump. He takes off at $\text{'}A\text{'}$ for his jump to $\text{'}B\text{'}$. Calculate the change in his gravitational potential energy between $\text{'}A\text{'}$ and $\text{'}B\text{'}$.