A train car with a mass of 2.5 x 104 kg traveling north at 1.8 m/s collides and joins with another train car with a mass of 3.5 x 104 kg that was traveling south at 0.78 m/s. What is the velocity (magnitude and direction) of the joined train cars after the collision.

Biased means unfair but that's all ik

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.