12. A 1.0 kg ball has a potential energy of 10 J and falls to the ground. What is the velocity right before it hits the ground?

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

The upward force acting on the wing of a airplane in flight is known as the "lift" force. (d)