Temperature measures the average kinetic energy of the molecules. When thetemperature is higher, the average kinetic energy is higher. This means the average velocity of the molecules is higher.As sugar is placed into the water, the water molecules collide with the sugar. Some of the kinetic energy of the water molecules is transferred to the sugar molecules. This causes some of the sugar molecules to move in all directions in the solution, instead of falling to the bottom of the container.As the temperature of the water is increased, more kinetic energy is transferred to the sugar molecules. This causes more of the sugar molecules to move at higher velocities in all directions in the solution, instead of falling to the bottom of the container.This causes more sugar molecules to dissolve faster in hot water than in cold water.