After falling for 3 seconds, an object will be falling downwards at what rate?

A falling object gains 9.8 x 3 = 29.4 m/s of downward speed in 3 seconds.

So after falling for 3 seconds, its downward speed is 29.4 m/s greater than whatever it was at the beginning of the 3 sec.

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.