2. Assume that the brakes in your car create a constant deceleration of 3.9 m/s2 regardless of how fast you are driving. If you double your driving speed from 15 m/s to 30 m/s, does the time required to come to a stop increase by a factor of two or a factor of four. Verify your answer by calculating the stopping times for both speeds?

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.

Answer///(d) atoms contain small,negatively charged particles;