Standing at the base of one of the cliffs of Mt. Arapiles in Victoria, Australia, a hiker hears a rock break loose from a height of 102 m. He can't see the rock right away but then does, 1.46 s later. (a)How far (in m) above the hiker is the rock when he can see it?

(b)How much time (in s) does he have to move before the rock hits his head?

British cologoinst admisitrion

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.

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