This is just a question so u can get points ʕ•ᴥ•ʔ

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.

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move.