A ball of mass 4.0 kg moving with an initial velocity of 2.0 meters per second to the right collides elastically with another ball of mass 6.0 kg moving within velocity of 4.0 meters per second to the left after the Collision the first ball is moving with a velocity of 5.2 m/s to the left. What is the velocity of the second ball after the collision?

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.

What does the start look like