Three point masses of 2kg each are located on the x-axis at the origin, at x=0.20m, and at x=0.50m. Find the center of mass of the system? 25. A 15g bullet traveling at 500m/s strikes an 0.8 kg block of wood that is balanced on the table edge 0.8m above the ground . If the bullet buries itself in the block. Find the distance D at which the block hits the floor?

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.

The answer is trial 3.