You are going on a car trip with your family across the United States. To your brother's
surprise, the AM radio station that your family
is listening to is coming from a city 600 miles
away. Explain to him how this is possible. Be
sure to describe how the ionosphere affects AM
radio transmissions.​

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.

Well in that case, since an object moves with a constant velocity, there will be no acceleration as it is not increasing in speed.