Gravitational potential energy is observed when an object is not in rest or is in motion. In this case, the helicopter is in motion where the direction is going upward with a negative potential energy. Thank you for your question. Please don't hesitate to ask in Brainly your queries.
A mixture is composed of more than one substance combined A pure substance cannot be decomposed in any reaction <span>Both are considered types of substances </span>hope it helps you playa!
