A coconut is falling from a palm tree. According to the model above, when does the coconut have the most potential energy

When it is in position one because it gathers all the energy to fall and slowly gets faster.

in 1972 the fluid—mosaic membrane model of membrane structure was proposed based on thermodynamic principals of organization of membrane lipids and proteins and available evidence of asymmetry and lateral mobility within the membrane matrix [s. j. singer and g. l. nicolson, science 175 (1972) 720–731].