A car with a mass of 200 kg starts at A and rolls down a track as shown in the diagram. It reaches B with a speed of 12m/s. Calculate the speed with which the car started at A.
assume there is no friction between A and B.

Ithink the answer is c but then again i'm probably wrong

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.