I don't know what you mean about which changes occurred in this process but if its why the dough starts rising then its caused by the carbon dioxide in baking soda and yeast which is a fungus
H = 280 ft, the height of the flower pot. g = 32 ft/s²
Neglect air resistance. Note that 1 ft/s = 15/22 mi/h
The initial vertical velocity is zero. Let v = the velocity with which the flower pot hits the ground. Then v² = 2gh = 2*(32 ft/s²)*(280 ft) = 17920 (ft/s)² v = 133.866 ft/s
Also, v = (133.866 ft/s)*(15/22 (mi/h)/(ft/s)) = 91.272 mi/h