Here's why:

* Temperature and Molecular Motion: Hot water molecules have more energy and move faster than cold water molecules. This increased motion allows them to collide with sugar molecules more frequently and with more force, breaking the bonds that hold the sugar crystals together.

* Solubility: The solubility of sugar in water increases with temperature. This means that at higher temperatures, water can hold more dissolved sugar.

In summary, the increased kinetic energy of water molecules at higher temperatures promotes faster dissolution of sugar.