A concrete block with a mass of was dropped from the top of a building. The ground exerted an impulse of 120 Newton-meters on the block when the block hit the ground . What was magnitude of the block's change in momentum at the moment it hit the ground ?

If an object is moving or in motion

That would be kinetic energy

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.