Change in momentum and Impulse
Work out the changes in momentum in the following cases:
a a mass of 3 kg slows from 3 m/s to 1.5 m/s (2 marks)

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.

It is increased due to the doppler effect. (apex)