A 0.40 kg object is moving on a frictionless surface with a speed of 30 m/s. A force of 2.0 N is
applied continually until the velocity of the object
has been reversed. How long was the force
applied?

Is there a picture to go along with this

No because scientist are still changing there mines today so they are not correct to this day

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.